Lamp unit and lighting system for vehicle

ABSTRACT

A lamp unit may be provided that includes: a first substrate; a second substrate disposed on the first substrate; and a plurality of light sources disposed on the second substrate, wherein at least two light source arrays are provided, in each of which a plurality of the light sources are disposed in a row, and wherein at least a first light source array and a second light source array among the light source arrays are individually driven.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority under 35 U.S.C. §119(e) ofKorean Patent Applications Nos. 10-2012-0076858 filed Jul. 13, 2012 and10-2013-0077499 filed Jul. 3, 2013 the subject matters of which areincorporated herein by reference.

BACKGROUND

1. Field

The embodiment relates to a lamp unit and a lighting system for avehicle.

2. Description of Related Art

In general, a lamp refers to a device for providing or controlling lightfor the specific purpose. An incandescent bulb, a fluorescent lamp, aneon lamp, etc., may be used as a light source of the lamp, andrecently, a light emitting diode (LED) is also being used. The LED is adevice which converts an electrical signal into infrared ray or light byusing compound semiconductor characteristics. Unlike the fluorescentlamp, the LED does not use harmful substances such as mercury or thelike and causes less environmental pollution. The LED has a longerlifespan than those of the incandescent bulb, the fluorescent lamp andthe neon lamp. Compared with the incandescent bulb, the fluorescent lampand the neon lamp, the LED has low power consumption, less glare andexcellent visibility due to high color temperature.

A lamp unit may be used in a backlight, a display device, a lightinglamp, an indicating lamp for a vehicle, or a head lamp, etc. Inparticular, since the lamp unit used in the vehicle is very closelyrelated to safe driving of the vehicle, it is very important to allow adriver of the vehicle adjacent to a traveling vehicle to clearlyidentify the light emitting states. Therefore, it is necessary that thelamp unit used in the vehicle should obtain not only the light intensityappropriate for safe driving standards but also the aesthetic featuresof the vehicle's appearance.

Also, the vehicle includes a lighting device which is used to allow adriver to see objects well in a traveling direction when driving and isused to cause drivers of other vehicles and road users to recognize thedriving conditions of his/her own vehicle.

Here, the lighting device is a head lamp which is attached to the frontof the vehicle and functions to throw light on the road along which thevehicle moves forward. Usually, the head lamp is formed by integrallyattaching a low beam for irradiating a short distance and a high beamfor irradiating a long distance, so that the low beam or the high beamis lighted according to the driver's choice.

The lighting pattern of the head lamp is required to meet a basicobjective to throw light as much as possible in such a manner that thedriver is able to obtain the best driving visibility, and is required toalso meet an objective to maintain the minimum glare in such a mannerthat a driver of another vehicle coming from the opposite lane is ableto safely drive.

However, such a head lamp for a vehicle provides only fixed directionallighting irrespective of the variously changing ambient conditions, roadconditions and the state of the vehicle, and cannot reflect the changesaccording to the ambient conditions when driving.

Therefore, in a condition where a front visibility is extremelyunfavorable, for example, fog, heavy rain or the like, it is hard forthe conventional head lamp to obtain sufficient visibility required forsafe driving of the driver. Further, in a highway where vehicles travelat a high speed, a larger amount of light capable of traveling a longerdistance is necessary due to the speed of the vehicle. However, theconventional head lamp provides a lighting pattern of a general roadwithout satisfying the requirement.

Also, while it is important to obtain ambient visibility and shortdistance visibility rather than long distance visibility in roads incities well-equipped with lighting, the conventional head lamp isconfigured to be suitable for a medium distance and a long distance, sothat energy cannot be efficiently utilized.

Additionally, the conventional head lamp is configured to light only thefront of the vehicle. Therefore, when the vehicle is tilted by drivingon the sloping road of an intersection or a curved road, it is notpossible to light in such a manner that the driver can obtain visibilityappropriate for this case.

The above references are incorporated by reference herein whereappropriate for appropriate teachings of additional or alternativedetails, features and/or technical background.

SUMMARY

One embodiment is a lamp unit. The lamp unit includes: a firstsubstrate; a second substrate disposed on the first substrate; and aplurality of light sources disposed on the second substrate. At leasttwo light source arrays are provided, in each of which a plurality ofthe light sources are disposed in a row. At least a first light sourcearray and a second light source array among the light source arrays areindividually driven.

The plurality of the light sources included in the first light sourcearray may be individually driven. The plurality of the light sourcesincluded in the second light source array may be interlinked with theplurality of the light sources included in the first light source array.

At least one of the numbers of, luminous fluxes of, distances between,light emission directions of, and disposition planes of the lightsources included in the first light source array and the light sourcesincluded in the second light source array may be mutually different.

A distance between a first parallel line extending from an upper surfaceof the light source included in the first light source array and asecond parallel line extending from an upper surface of the light sourceincluded in the second light source array may be less than a distancebetween the upper surface and a lower surface of the light sourceincluded in the first light source array or the second light sourcearray.

A first parallel line extending from an upper surface of the lightsource included in the first light source array may meet an uppersurface or a side surface of the light source included in the secondlight source array.

The first light source array may be supported by a first area of thesecond substrate. The second light source array may be supported by asecond area of the second substrate. An angle between a surface of thefirst area of the second substrate facing the first light source arrayand a surface of the second area of the second substrate facing thesecond light source array may be from 91 to 179 degrees.

In the light sources included in the light source array, a luminous fluxof the light source disposed in the central area of the light sourcearray may be larger than a luminous flux of the light source disposed inthe edge area of the light source array.

A distance between the light sources included in the light source arraymay be increased toward the edge area from the central area of the lightsource array.

At least two of the light sources included in the light source array maybe disposed on different planes or have different luminous fluxes.

The first substrate may be a metal substrate having a first thermalconductivity. The second substrate may be an insulating substrate havinga second thermal conductivity.

The first thermal conductivity of the first substrate may be greaterthan the second thermal conductivity of the second substrate.

The first substrate may include a cavity formed in a predetermined areathereof. The second substrate may be disposed in the cavity of the firstsubstrate.

The first substrate and the second substrate may be formed of the samematerial.

A surface of the second substrate may be a concave surface.

The second substrate may include at least one projection protruding fromthe surface thereof by a predetermined height.

The lamp unit may further include a barrier disposed around a pluralityof the light sources. The barrier may include a metallic reflectivematerial.

A distance d11 between the light sources included in the first lightsource array is less than a distance d13 between the light sourceincluded in the first light source array and the light source includedin the second light source array.

A ratio of the distance d11 and the distance d13 may be 1:1.1˜1:10.

Another embodiment is a vehicle lamp device. The vehicle lamp deviceincludes: a lamp unit generating light; a reflector which reflects thelight generated from the lamp unit and changes a direction of the light;and a lens which refracts the light reflected from the reflector. Thelamp unit may use the above-described lamp unit.

Further another embodiment is a vehicle lighting system. The vehiclelighting system includes: a sensor unit sensing ambient conditions ofthe vehicle; a head lamp including a lamp unit which includes a firstsubstrate, a second substrate disposed on the first substrate, and nnumber of light source arrays (n is an integer equal to or greater than2) formed by disposing a plurality of light sources on the secondsubstrate, wherein the light source array includes a first light sourcearray and a second light source array, which are adjacent to each other,are electrically isolated from each other and are individually driven;and an electronic control unit individually driving the first lightsource array and the second light source array in accordance with thesensing result produced by the sensor unit.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments will be described in detail with reference to thefollowing drawings in which like reference numerals refer to likeelements wherein:

FIG. 1 is a block diagram showing a configuration of a lighting systemaccording to an embodiment;

FIGS. 2 to 9 are front views showing patterns of beams irradiated from alamp unit of a heat lamp shown in FIG. 1 in accordance with theembodiment;

FIG. 10 is a view showing the overall structure of the lamp unit;

FIGS. 11 a and 11 b are a plan view and a cross sectional view,respectively for describing the lamp unit according to the embodiment;

FIGS. 12 a and 12 b are views showing light source arrays of the lampunit according to the embodiment;

FIG. 13 is a plan view showing that light sources according to a firstembodiment are electrically connected to each other;

FIGS. 14 a and 14 b are plan views showing that light sources accordingto a second embodiment are electrically to each other;

FIGS. 15 a and 15 b are plan views showing that light sources accordingto a third embodiment are electrically connected to each other;

FIGS. 16 a and 16 b are plan views showing that light sources accordingto a fourth embodiment are electrically connected to each other;

FIGS. 17 a to 17 c are plan views showing the number of the lightsources included in the light source array;

FIGS. 18 a to 18 c are views showing the luminous flux of the lightsource included in the light source array;

FIGS. 19 a to 19 c are plan view showing the distance between the lightsources included in the light source array;

FIGS. 20 a and 20 b are plan views showing the distance between thelight source arrays and the distance between the light sources;

FIGS. 21 a and 21 b are plan views showing the distribution of lightsources according to the first embodiment;

FIGS. 22 a and 22 b are plan views showing the distribution of lightsources according to the second embodiment;

FIGS. 23 a and 23 b are views showing the distribution of light sourcesaccording to the third embodiment;

FIGS. 24 a to 24 c are cross sectional views showing the distribution oflight sources according to FIG. 23 b;

FIGS. 25 a to 25 d are cross sectional views showing light emissiondirections of the light sources according to FIG. 23 b;

FIGS. 26 a and 26 b are views showing the distribution of light sourcesaccording to the fourth embodiment;

FIGS. 27 a and 27 b are views showing the distribution of light sourcesaccording to a fifth embodiment;

FIGS. 28 a and 28 b are cross sectional views showing the distributionof light sources according to FIG. 27 b;

FIGS. 29 a to 29 c are cross sectional views showing light emissiondirections of the light sources according to FIG. 18 b;

FIGS. 30 a and 30 b are views showing the distribution of light sourcesaccording to a sixth embodiment;

FIGS. 31 a to 31 c are views showing the structure of the light sourceaccording to the embodiment;

FIGS. 32 a and 32 b are plan views showing the light color distributionof the light source array according to the embodiment;

FIGS. 33 a to 33 c are cross sectional views showing the luminous fluxof the light sources included in the light source array;

FIGS. 34 a and 34 b are cross sectional views showing the distancebetween the light sources included in the light source array;

FIGS. 35 a and 35 b are cross sectional views showing the distributionof the light sources included in the light source array according to thefirst embodiment;

FIGS. 36 a to 36 c are cross sectional views showing the distribution ofthe light sources included in the light source array according to thesecond embodiment;

FIGS. 37 a to 37 e are cross sectional views showing the substratestructure of the lamp unit according to the embodiment;

FIGS. 38 a to 38 c are cross sectional views showing the top surface ofa second substrate;

FIGS. 39 a to 39 c are cross sectional views showing the side of thesecond substrate;

FIGS. 40 a to 40 c are cross sectional views showing protrusions of thesecond substrate according to the first embodiment;

FIGS. 41 a and 41 b are cross sectional views showing protrusions of thesecond substrate according to the second embodiment;

FIG. 42 is a cross sectional view showing protrusions of the secondsubstrate according to the third embodiment;

FIGS. 43 a and 43 b are views showing the barrier of the lamp unitaccording to the embodiment;

FIGS. 44 a to 44 d are cross sectional views showing the distribution ofthe barrier of the lamp unit according to the embodiment;

FIGS. 45 a and 45 b are cross sectional views showing the cover glass ofthe lamp unit according to the embodiment;

FIGS. 46 a to 46 d are cross sectional views showing the phosphor layerof the lamp unit according to the embodiment;

FIG. 47 is a cross sectional view showing the head lamp of the vehicleincluding the lamp unit according to the first embodiment; and

FIG. 48 is a front view showing the head lamp of the vehicle includingthe lamp unit according to the second embodiment.

DETAILED DESCRIPTION

Hereafter, exemplary embodiments that can be easily embodied by a personhaving ordinary skill in the art to which the embodiment belongs will bedescribed in detail with reference to the accompanying drawings.However, the embodiments and the constitution illustrated in thedrawings are merely preferable embodiments, so that it should beunderstood that various equivalents and modifications can exist whichcan replace the embodiments described in the time of the application.Also, in the detailed description of the operation principle of theexemplary embodiment, the detailed description of known functions andconfigurations incorporated herein is omitted to avoid making thesubject matter of the present invention unclear. The below-mentionedterms are defined in consideration of the functions of the embodiment.The meaning of each term should be construed based on this entirespecification. Throughout the drawings, parts having similar functionsand operations are given the same reference numeral.

The embodiment provides a lighting system for a vehicle. In the lightingsystem for a vehicle in accordance with the embodiment of the presentinvention, a sensor unit capable of sensing ambient conditions of thevehicle is interlinked with an electronic control unit capable ofcontrolling the head lamp of the vehicle, and individually operable lampunits are employed, so that it is possible to implement a variety oflighting patterns appropriate for the ambient conditions of the vehicle,to improve the convenience for users by more efficiently controlling thevehicle, and to save energy.

[Lighting System According to the Embodiment]

FIG. 1 is a block diagram showing a configuration of a lighting systemaccording to an embodiment.

Referring to FIG. 1, a vehicle lighting system 10 according to theembodiment may include a sensor unit 100, an electronic control unit(ECU) 700 and a head lamp 305 including a lamp unit. The sensor unit 100is able to sense the ambient conditions of the vehicle. The sensor unit100 may include at least any one of a speed sensor 110 sensing the speedof the vehicle, an optical sensor 120 sensing the light intensity, amotion sensor 130 sensing the movement of the vehicle, for example,forward and backward movement, right and left turning, etc., a tiltsensor 140 sensing the tilt of the vehicle, an image sensor 150 likeCMOS or CCD, etc., sensing the ambient images of the vehicle, a radarsensor 160 sensing a distance between an obstacle and the vehicle orbetween the vehicle and another vehicle, a rain sensor 170 sensingmoisture like rainwater, and a location information sensor 180. However,the sensor unit 100 is not limited to include the aforementionedsensors, and may include any sensor capable of sensing the ambientconditions of the vehicle. For example, the sensor unit 100 may includea sensor capable of sensing sound, wind, smoke, gravity, location, etc.Through the sensor unit 100, it is possible to sense various ambientconditions of the vehicle.

The ECU 700 is able to individually drive light sources constituting alamp unit in accordance with the sensing result produced by the sensorunit 100. For example, when the lamp unit includes a plurality of lightsource arrays, the ECU 700 is able to individually drive the pluralityof the light source arrays in accordance with the sensing resultproduced by the sensor unit 100. Therefore, a lighting pattern can beimplemented, which is appropriate for the ambient conditions of thevehicle.

The ECU 700 may include a driving mode determination unit 710 whichdetermines the driving mode of the vehicle in accordance with thedriving environment by means of the sensing value sensed by the sensorunit 100 and may include a driving signal output unit 720 which outputsa driving signal for driving the lamp unit on the basis of the drivingmode determined by the driving mode determination unit 710.

Here, the driving mode determined by the driving mode decision unit 710may be comprised of a normal driving mode, a high-speed driving mode, aslow driving mode, a parking mode, a stop mode, an city driving mode, asuburban driving mode, a curve driving mode, a slope driving mode, arain driving mode, an oncoming vehicle anti-glare driving mode. Thiswill be described in detail with reference to the following drawings.

The head lamp 305 may include the lamp unit which includes a firstsubstrate, a second substrate disposed on the first substrate, and aplurality of light source arrays formed by disposing a plurality of thelight sources on the second substrate. A first light source array and asecond light source array are adjacent to each other and areelectrically isolated from each other. The first light source array andthe second light source array may be individually driven.

Here, the head lamp 305 may further include a reflector which changesthe direction of light generated from the lamp unit, and a lens whichrefracts the light reflected from the reflector. The light source may bea light emitting diode.

As such, through the use of the lamp unit which can be individuallydriven, it is possible to provide a variety of beam patterns, lightcolors and luminous fluxes of light in accordance with the ambientconditions of the vehicle. An optimum luminous flux can be provided by asmall number of the light sources and the overall size of the lamp unitcan be reduced. Also, there is no need to provide a separate drivingdevice which pivots the lamp unit in the up, down, right and leftdirections.

The lamp unit will be described in detail later in FIGS. 10 to 19.

The vehicle lighting system according to the embodiment may furtherinclude a display unit 600 which displays an image sensed by the sensorunit 100. For example, the vehicle lighting system may further includethe display unit 600 which displays an image sensed by the image sensor150. The display unit 600 may be disposed within the vehicle such thatthe driver can watch the display unit 600. For instance, the displayunit 600 may be disposed on the rearview mirror.

Also, the vehicle lighting system according to the embodiment mayfurther include a side lighting unit 505 disposed on both sides of thevehicle, e.g., the side or rear of the outside mirror, etc.

When the parking mode is determined by the driving mode determinationunit 710, the side lighting unit 505 is operated, and then light isprovided on both sides of the parking vehicle, so that the conveniencefor the driver can be enhanced.

[Patterns of Beams Irradiated from the Lamp Unit]

FIGS. 2 to 9 are front views showing patterns of beams irradiated from alamp unit of a heat lamp shown in FIG. 1 in accordance with theembodiment. Referring to FIGS. 1 to 9, based on the driving modedetermined by the driving mode determination unit 710 in accordance withthe sensing value sensed by the sensor unit 100, patterns of the beamsirradiated from the head lamp 305 including the lamp unit are shown.

FIG. 2 is a front view showing a beam pattern when the driving mode ofthe vehicle is determined to the normal driving mode by the driving modedetermination unit 710 in accordance with the sensing value sensed bythe sensor unit 100. When the vehicle travels on a normal road, thedriving mode determination unit 710 may determine the driving mode ofthe vehicle to the normal driving mode by using at least one of thespeed sensor 110, the motion sensor 130 and the image sensor 150. Whenthe speed sensor 110 detects a normal speed or when the motion sensor130 detects the forward movement of the vehicle or when the image sensor150 detects a front object, the driving mode determination unit 710 maydetermine the driving mode of the vehicle to the normal driving mode.Here, the normal speed may be within a predetermined range of areference speed.

In the embodiment, while the normal driving mode is determined by usingthe speed sensor 110, the motion sensor 130 and the image sensor 150,the kind of the sensor is not limited to this. The normal driving modemay be determined by using another kind of sensor.

When the driving mode of the vehicle is determined to the normal drivingmode, through the individual operation of the light sources included inthe lamp unit in a normal environment, it is possible to implement abeam pattern of a low beam which widely irradiates the short-distancefront and a portion of the long-distance front.

FIG. 3 is a front view showing a beam pattern when the driving mode ofthe vehicle is determined to the high-speed driving mode by the drivingmode determination unit 710. When the vehicle travels on a highway at ahigh speed, the driving mode determination unit 710 may determine thedriving mode of the vehicle to the high-speed driving mode by using atleast one of the speed sensor 110, the optical sensor 120, the motionsensor 130 and the image sensor 150.

For example, when the speed sensor 110 detects a high speed or when themotion sensor 130 detects the forward movement of the vehicle or whenthe image sensor 150 detects a front object, the driving modedetermination unit 710 may determine the driving mode of the vehicle tothe high-speed driving mode. Here, the high speed may be within apredetermined range of a reference speed.

In the embodiment, while the normal driving mode is determined by usingthe speed sensor 110, the motion sensor 130 and the image sensor 150,the kind of the sensor is not limited to this. The normal driving modemay be determined by using another kind of sensor.

When the driving mode of the vehicle is determined to the high-speeddriving mode, through the individual operation of the light sourcesincluded in the lamp unit, it is possible to implement a beam pattern ofthe high-speed driving mode, which is capable of irradiating theshort-distance, medium-distance and long-distance fronts and of morewidely irradiating the medium-distance front.

FIG. 4 is a front view showing a beam pattern when the driving mode ofthe vehicle is determined to the parking driving mode by the drivingmode determination unit 710. When the vehicle is parked through theforward and backward movement, the driving mode determination unit 710may determine the driving mode of the vehicle to the parking mode byusing at least one of the speed sensor 110, the motion sensor 130, theimage sensor 150 and the radar sensor 160.

When the speed sensor 110 detects a low speed, or when the motion sensor130 detects the forward and backward movement and stop or when the imagesensor 150 detects an approaching object in the font or rear or when theradar sensor detects an object, the driving mode determination unit 710may determine the driving mode of the vehicle to the parking mode. Here,the low speed may be within a predetermined range of a reference speed.

In the embodiment, while the parking mode is determined by using thespeed sensor 110 and the motion sensor 130, the kind of the sensor isnot limited to this. The parking mode may be determined by using anotherkind of sensor.

When the driving mode of the vehicle is determined to the parking mode,through the individual operation of the light sources included in thelamp unit, it is possible to implement a beam pattern of the parkingmode, which is capable of more widely irradiating the short-distancefront. Here, as described above, the side lighting unit 505 is operated,which helps the driver to park the vehicle, and the driver is able toidentify the image, which is outputted by the image sensor 150, throughthe display unit 600.

FIG. 5 is a front view showing a beam pattern when the driving mode ofthe vehicle is determined to the city driving mode by the driving modedetermination unit 710. When the vehicle travels on a road in citieswell-equipped with exterior lighting like a street lamp, a signboard andthe like, the driving mode determination unit 710 may determine thedriving mode of the vehicle to the city driving mode by using at leastone of the speed sensor 110, the optical sensor 120 and the locationinformation sensor 180.

When the speed sensor 110 detects the normal speed or when the opticalsensor 120 detects the light intensity greater than a certain value orwhen the location information sensor 180 detects that the vehicle islocated in the city, the driving mode determination unit 710 maydetermine the driving mode of the vehicle to the city driving mode. Aglobal positioning system (GPS) may be used as the location informationsensor 180.

In the embodiment, while the city driving mode is determined by usingthe speed sensor 110, the optical sensor 120 and the locationinformation sensor 180, the kind of the sensor is not limited to this.The city driving mode may be determined by using another kind of sensor.

When the driving mode of the vehicle is determined to the city drivingmode, through the individual operation of the light sources included inthe lamp unit, it is possible to implement a beam pattern of the citydriving mode, which is capable of very widely irradiating theshort-distance front.

FIG. 6 is a front view showing a beam pattern when the driving mode ofthe vehicle is determined to the suburban driving mode by the drivingmode determination unit 710. When the vehicle travels in the suburbslike a country road, the driving mode determination unit 710 maydetermine the driving mode of the vehicle to the suburban driving modeby using at least one of the speed sensor 110, the optical sensor 120,the radar sensor 160 and the location information sensor 180.

When the speed sensor 110 detects the normal speed or when the opticalsensor 120 detects the light intensity less than a certain value or whenthe radar sensor 160 detects a plurality of front objects or when thelocation information sensor 180 detects that the vehicle is located inthe suburbs, the driving mode determination unit 710 may determine thedriving mode of the vehicle to the suburban driving mode. A globalpositioning system (GPS) may be used as the location information sensor180.

In the embodiment, while the suburban driving mode is determined byusing the speed sensor 110, the optical sensor 120, the radar sensor 160and the location information sensor 180, the kind of the sensor is notlimited to this. The suburban driving mode may be determined by usinganother kind of sensor.

When the driving mode of the vehicle is determined to the suburbandriving mode, through the individual operation of the light sourcesincluded in the lamp unit, it is possible to implement a beam pattern ofthe suburban driving mode, which is capable of irradiating theshort-distance, medium-distance and long-distance fronts by tilting thelamp unit more downward than the beam pattern of the high-speed drivingmode.

FIG. 7 is a front view showing a beam pattern when the driving mode ofthe vehicle is determined to the curve driving mode by the driving modedetermination unit 710. When the vehicle travels on a curved road, thedriving mode determination unit 710 may determine the driving mode ofthe vehicle to the curved driving mode by using at least one of thespeed sensor 110, the motion sensor 130 and the tilt sensor 140.

When the speed sensor 110 detects a low speed or a normal speed or whenthe motion sensor 130 detects turning or when the tilt sensor 140detects the tilt of the vehicle, the driving mode determination unit 710may determine the driving mode of the vehicle to the curved drivingmode.

In the embodiment, while the curved driving mode is determined by usingthe speed sensor 110, the motion sensor 130 and tilt sensor 140, thekind of the sensor is not limited to this. The curved driving mode maybe determined by using another kind of sensor.

When the driving mode of the vehicle is determined to the curved drivingmode, through the individual operation of the light sources included inthe lamp unit, it is possible to implement a beam pattern of the curveddriving mode, which is capable of irradiating the road in the turningdirection.

FIG. 8 is a front view showing a beam pattern when the driving mode ofthe vehicle is determined to the rain driving mode by the driving modedetermination unit 710. When the vehicle travels on a wet road, thedriving mode determination unit 710 may determine the driving mode ofthe vehicle to the rain driving mode by using at least one of theoptical sensor 120, the radar sensor 160 and the rain sensor 170.

When the optical sensor 120 detects the light intensity less than acertain value or when the radar sensor 160 or the rain sensor 170detects rain, etc., the driving mode determination unit 710 maydetermine the driving mode of the vehicle to the rain driving mode.

In the embodiment, while the rain driving mode is determined by usingthe optical sensor 120, the radar sensor 160 and the rain sensor 170,the kind of the sensor is not limited to this. The rain driving mode maybe determined by using another kind of sensor.

When the driving mode of the vehicle is determined to the rain drivingmode, through the individual operation of the light sources included inthe lamp unit, it is possible to implement a beam pattern of the raindriving mode, which is capable of blocking a portion of theshort-distance front and of irradiating portions of the medium-distanceand long-distance fronts.

FIG. 9 is a front view showing a beam pattern when the driving mode ofthe vehicle is determined to the oncoming vehicle anti-glare drivingmode by the driving mode determination unit 710. When another vehiclecomes from the opposite lane of a traveling vehicle, the driving modedetermination unit 710 may determine the driving mode of the vehicle tothe oncoming vehicle anti-glare driving mode by using at least one ofthe optical sensor 120, the motion sensor 130, the image sensor 150 andthe radar sensor 160.

When the optical sensor 120 detects the light generated from a lamp ofthe oncoming vehicle or when the motion sensor 130 detects the forwardmovement of the vehicle or when the image sensor 150 or the radar sensor160 recognizes the oncoming vehicle, the driving mode determination unit710 may determine the driving mode of the vehicle to the oncomingvehicle anti-glare driving mode.

In the embodiment, while the oncoming vehicle anti-glare driving mode isdetermined by using the optical sensor 120, the motion sensor 130, theimage sensor 150 and the radar sensor 160, the kind of the sensor is notlimited to this. The oncoming vehicle anti-glare driving mode may bedetermined by using another kind of sensor.

When the driving mode of the vehicle is determined to the oncomingvehicle anti-glare driving mode, through the individual operation of thelight sources included in the lamp unit, it is possible to implement abeam pattern of the oncoming vehicle anti-glare driving mode, which iscapable of irradiating the road other than another vehicle coming fromthe opposite lane in order to prevent a driver of the another vehiclefrom feeling glare.

[Configuration of the Lamp Unit]

FIG. 10 is a view showing the overall structure of the lamp unit.

As shown in FIG. 10, the lamp unit may include a light source module 1and a reflector 2 determining an angle of orientation of light emittedfrom the light source module 1. Here, the light source module 1 mayinclude at least one LED light source 1 a disposed on a printed circuitboard (PCB) 1 b. The reflector 2 collects light emitted from the LEDlight source 1 a and allows the light to have a certain angle oforientation and to be emitted through an opening. A reflective surfacemay be disposed on the inner surface of the reflector 2.

FIGS. 11 a and 11 b are a plan view and a cross sectional view,respectively for describing the lamp unit according to the embodiment.

As shown in FIGS. 11 a and 11 b, the embodiment may include a firstsubstrate 100, a second substrate 200 and a plurality of light sources300.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

Here, the area of the second substrate 200 may be less than that of thefirst substrate 100. According to the circumstances, the area of thesecond substrate 200 may be equal to that of the first substrate 100.

A circuit pattern may be formed on the second substrate 200. The lightsource 300 may be electrically connected to the circuit pattern of thesecond substrate 200 via wires.

Subsequently, the first substrate 100 may be a metal substrate having afirst thermal conductivity. The second substrate 200 may be aninsulating substrate having a second thermal conductivity.

Here, the first thermal conductivity of the first substrate 100 may bedifferent from the second thermal conductivity of the second substrate200. For example, the first thermal conductivity of the first substrate100 may be greater than the second thermal conductivity of the secondsubstrate 200. This intends that the heat generated from the lightsource 300 disposed on the second substrate 200 is rapidly discharged tothe outside.

For example, the first substrate 100 may be a metal cored printedcircuit board (MCPCB).

Also, the first substrate 100 may be a heat dissipation plate havinghigh thermal conductivity. The first substrate 100 may be made of anyone selected from the group consisting of copper (Cu), aluminum (Al),silver (Ag), gold (Au), or of an alloy thereof.

The second substrate 200 may be made of a nitride, such as AlN,exhibiting high thermal conductivity.

According to circumstances, the second substrate 200 may include ananodized layer.

The first substrate 100 and the second substrate 200 may be formed invarious shapes. For example, the first substrate 100 may include acavity formed in a predetermined area thereof, and the second substrate200 may be disposed in the cavity of the first substrate 100.

In this case, the first substrate 100 may include at least one of Al,Cu, and Au, and the second substrate 200 may include AlN.

As another example, the first substrate 100 and the second substrate 200may be sequentially stacked to form a laminated structure.

In this case, the first substrate 100 may include at least one selectedfrom among Al, Cu, and Au, and the second substrate 200 may include ananodized layer.

As yet another example, the first substrate 100 and the second substrate200 may be formed of the same material. In this case, the firstsubstrate 100 and the second substrate 200 may include at least one ofAlN, Al, Cu, and Au.

The second substrate 200 may have a flat upper surface, on which thelight sources 300 are disposed. According to circumstances, the secondsubstrate 200 may have a concave upper surface or a convex uppersurface.

In another case, the upper surface of the second substrate 200 may be acombination of at least two among a concave upper surface, a convexupper surface, and a flat upper surface.

The second substrate 200 may include at least one projection (not shown)protruding from the upper surface thereof, on which the light sources300 are disposed, by a predetermined height.

An angle between the upper surface of the second substrate 200 and aside of the projection may be a right angle or an obtuse angle.

This intends that the light source 300 may be disposed on the projectionas described above to vary light emission directions of the light source300, thereby realizing various beam patterns.

Here, at least one light source 300 may be disposed on at least one ofthe side and an upper surface of the projection (not shown).

Meanwhile, the plurality of the light sources 300 may be disposed on thesecond substrate 200 at regularly spaced intervals.

Here, the plurality of the light sources 300 may be eutectic bonded ordie bonded to the second substrate 200.

The plurality of the light sources 300 may be top view type lightemitting diodes. According to circumstances, the plurality of the lightsources 300 may be side view type light emitting diodes.

In another case, the plurality of the light sources 300 may be formed bymixing the top view type light emitting diodes and the side view typelight emitting diodes.

Here, the light source 300 may be a light emitting diode (LED) chip. TheLED chip may be a red LED chip, a blue LED chip, or an ultraviolet LEDchip. Alternatively, the LED chip may be at least one selected from thegroup consisting of a red LED chip, a green LED chip, a blue LED chip, ayellow LED chip and a white LED chip, or may be formed in the form of apackage obtained by combining them.

A white LED may be realized by using a yellow phosphor on a blue LED orsimultaneously using a red phosphor and green phosphor on a blue LED.Also, a white LED may be realized by simultaneously using a yellowphosphor, red phosphor, and green phosphor on a blue LED. As an example,in a case in which the lamp unit is applied to a head lamp of a vehicle,the light source 300 may be a vertical lighting emitting chip, such as awhite lighting emitting chip. However, embodiments are not limitedthereto.

Subsequently, a light source array may include the plurality of thelight sources 300 arranged in a row. The light source arrays may bedisposed in parallel with each other.

Here, a neighboring first light source array 310 and a second lightsource array 330 may be electrically isolated from each other andindividually driven.

Here, the light sources included in the first light source array 310 maybe electrically isolated from each other and individually driven, andthe light sources included in the second light source array 330 may beelectrically isolated from each other and individually driven.

According to circumstances, the light sources included in the firstlight source array 310 may be electrically connected to each other andsimultaneously driven, and the light sources included in the secondlight source array 330 may be electrically connected to each other andsimultaneously driven.

In another case, the light sources included in the first light sourcearray 310 may be electrically isolated from each other and individuallydriven, and the light sources included in the second light source array330 may be electrically connected to each other and simultaneouslydriven.

The number of the light sources included in the first light source array310 may be equal to that of the light sources included in the secondlight source array 330. According to circumstances, the number of thelight sources included in the first light source array 310 may bedifferent from that of the light sources included in the second lightsource array 330.

For example, the number of the light sources included in the first lightsource array 310 may be greater than that of the light sources includedin the second light source array 330.

Also, the luminous flux of the light sources included in the first lightsource array 310 may be equal to that of the light sources included inthe second light source array 330. According to circumstances, theluminous flux of the light sources included in the first light sourcearray 310 may be different from that of the light sources included inthe second light source array 330.

For example, the luminous flux of the light sources included in thefirst light source array 310 may be greater than that of the lightsources included in the second light source array 330.

The distance between the light sources included in the first lightsource array 310 may be equal to the distance between the light sourcesincluded in the second light source array 330. According tocircumstances, the distance between the light sources included in thefirst light source array 310 may be different from the distance betweenthe light sources included in the second light source array 330.

For example, the distance between the light sources included in thefirst light source array 310 may be less than the distance between thelight sources included in the second light source array 330.

According to circumstances, the first light source array 310 and thesecond light source array 330 may be spaced apart from each other by afirst distance, and the light sources included in the first light sourcearray 310 or the second light source array 330 may be spaced apart fromeach other by a second distance. The first distance may be equal to thesecond distance. According to circumstances, the first distance may bedifferent from the second distance.

For example, the first distance may be greater than the second distance.

A ratio of the first distance and the second distance may be about 1.1:1to 10:1.

Also, the light sources included in the first light source array 310 andthe light sources included in the second light source array 330 may bedisposed in parallel with each other.

When the number of the light sources included in the first light sourcearray 310 is equal to that of the light sources included in the secondlight source array 330, the light sources included in the first lightsource array 310 and the light sources included in the second lightsource array 330 may be disposed one to one corresponding to each other.

According to circumstances, the light sources included in the firstlight source array 310 and the light sources included in the secondlight source array 330 may be disposed alternately with each other.

Next, the light sources included in the first light source array 310 andthe light sources included in the second light source array 330 may bedisposed on the same plane. According to circumstances, the lightsources included in the first light source array 310 and the lightsources included in the second light source array 330 may be disposed ondifferent planes.

For example, the light sources included in the first light source array310 may be disposed higher than the light sources included in the secondlight source array 330.

This intends that the light sources included in the first light sourcearray 310 and the light sources included in the second light sourcearray 330 are disposed on different planes as described above to varylight emission directions of the light sources 300, thereby realizingvarious beam patterns.

Among the light sources 300 included in the light source array, theluminous flux of the light source 300 disposed in the central area ofthe light source array may be equal to that of the light sources 300located at the edge of the light source array. According tocircumstances, the luminous flux of the light source 300 disposed in thecentral area of the light source array may be different from that of thelight sources 300 located at the edge of the light source array.

For example, the luminous flux of the light source 300 disposed in thecentral area of the light source array may be greater than that of thelight sources 300 located at the edge of the light source array.

This intends that a luminance of the central area is heightened in abeam pattern emitted to the outside.

Also, the distances between the light sources 300 included in the lightsource array may be equal to each other or may be different from eachother according to circumstances.

For example, the distance between the light sources 300 included in thelight source array may be gradually increased toward the edge from thecentral area of the light source array.

This intends that a luminance of the central area is heightened in abeam pattern emitted to the outside.

Also, the light sources 300 included in the light source array may bedisposed on the same plane. According to circumstances, at least one ofthe light sources 300 included in the light source array may be disposedon a plane different from the plane on which the other light sources 300are disposed.

The light sources 300 included in the light source array may have thesame light emission direction. According to circumstances, at least oneof the light sources 300 included in each light source array may have alight emission direction different from that of the other light sources300.

The light sources 300 included in the light source array may have thesame luminous flux. According to circumstances, at least one of thelight sources 300 included in the light source array may have a luminousflux different from that of the other light sources 300.

Also, the light sources 300 included in the light source array maygenerate the same color light. According to circumstances, at least oneof the light sources 300 included in the light source array may generatecolor light different from that of the other light sources 300.

Meanwhile, the embodiment may further include a barrier (not shown). Thebarrier may be disposed around the plurality of the light sources 300.

Here, the barrier is provided to protect the light sources 300 and wiresfor electrical connection of the light sources 300. The barrier may beformed in various shapes based on the shape of the second substrate 200.

For example, the barrier may be formed in a polygonal or ring shape,

The barrier may include a metallic reflective material. The barrier mayreflect light generated from the light source 300 to improve lightextraction efficiency of the light source 300.

Here, the barrier may include at least one of aluminum (Al), silver(Ag), platinum (Pt), rhodium (Rh), radium (Rd), palladium (Pd), andchrome (Cr).

Subsequently, the distance between the barrier and the light source 300and the height of the barrier may be adjusted to control an orientationangle of light emitted from the light source 300.

Also, the embodiment may further include a cover glass (not shown). Thecover glass may be spaced apart from the plurality of the light sources300 by a predetermined interval.

Here, the distance between the cover glass (not shown) and the lightsources 300 may be about 0.1 mm to 50 mm.

The cover glass may protect the light source 300 and transmit lightgenerated from the light source 300.

The cover glass may be anti-reflectively coated to improve thetransmittance of the light generated from the light source 300.

Here, an anti-reflective coating film may be attached to a glass-basedmaterial, or an anti-reflective coating solution may be applied to aglass-based material by spin coating or spray coating to form ananti-reflective coating layer, so that the anti-reflective coating maybe performed.

For example, the anti-reflective coating layer may include at least oneof TiO₂, SiO₂, Al₂O₃, Ta₂O₃, ZrO₂, and MgF₂.

The cover glass may include a hole (not shown) or an opening (notshown). Gas caused by heat generated from the light source 300 may bedischarged through the hole or the opening.

The cover glass may be formed in the shape of a dome having a hole or anopening. According to circumstances, the cover glass may include a colorfilter which transmits only light having a specific wavelength among thelight generated from the light source 300.

In another case, the cover glass may include a particular pattern (notshown) capable of adjusting an orientation angle of the light generatedfrom the light source 300.

Here, the kind and shape of the pattern are not limited.

The embodiment may further include a phosphor layer (not shown). Thephosphor layer may be disposed on the plurality of the light sources.

Here, the phosphor layer may be disposed corresponding respectively tothe plurality of the light sources 300.

The phosphor layer may include at least one of a red fluorescentsubstance, a yellow fluorescent substance, and a green fluorescentsubstance.

In the embodiment configured as such, the plurality of the light sourcearrays that can be individually driven may be disposed, therebyproviding various light colors and luminous fluxes depending uponexternal environments.

In this embodiment, the plurality of light source arrays are efficientlydisposed, thereby providing optimum luminous flux by using a smallnumber of the light sources and reduce the total size of the lamp unit.

Also, in this embodiment, the light source arrays having various lightemission directions are disposed, thereby providing various beampatterns depending upon external environments.

FIGS. 12 a and 12 b are views showing light source arrays of the lampunit according to the embodiment. More specifically, FIG. 12 a is a planview showing the lamp unit having an odd number of the light sourcearrays disposed therein. FIG. 12 b is a plan view showing a lamp unithaving an even number of the light source arrays disposed therein.

As shown in FIGS. 12 a and 12 b, the embodiment may include the firstsubstrate 100, the second substrate 200, and the plurality of the lightsources 300.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, an odd number of the light source arrays or an even number of thelight source arrays may be provided.

For example, as shown in FIG. 12 a, an odd number of the light sourcearrays may be provided. A first light source array 310, a second lightsource array 330, and a third light source arrays 350 may be disposed onthe second substrate 200 in three rows in parallel with one another.

Here, the first, second, and third light source arrays 310, 330 and 350may be electrically isolated from each other and individually driven.

Also, the light sources included in the first, second, and third lightsource arrays 310, 330 and 350 may be electrically isolated from eachother and individually driven.

According to circumstances, the light sources included in at least oneof the first, second, and third light source arrays 310, 330 and 350 maybe electrically connected to each other and simultaneously driven, andthe light sources included in the other light source arrays may beelectrically connected to each other and simultaneously driven.

For example, the light sources included in the first light source array310 may be electrically connected and simultaneously driven, and thelight sources included in the second and third light source arrays 330and 350 may be electrically connected and simultaneously driven.

Further, in the embodiment of FIG. 12 b, an even number of the lightsource arrays may be provided. The first, second, third, and fourthlight source arrays 310, 330, 350 and 370 may be disposed on the secondsubstrate 200 in four rows in parallel with each other.

Here, the neighboring first and second light source arrays 310 and 330may be included in a first light source array group 300 a, and theneighboring third and fourth light source arrays 350 and 370 may beincluded in a second light source array group 300 b.

Here, the first and second light source array groups 300 a and 300 b maybe electrically isolated from each other and individually driven.

Also, the first and second light source arrays 310 and 330 included inthe first light source array group 300 a and the third and fourth lightsource arrays 350 and 370 included in the second light source arraygroup 300 b may be electrically isolated from each other andindividually driven.

Further, the light sources included in the first, second, third, andfourth light source arrays 310, 330, 350 and 370 may be electricallyisolated from each other and individually driven.

According to circumstances, the light sources included in at least anyone of the first and second light source array groups 300 a and 300 bmay be electrically connected to each other and simultaneously driven,and the light sources included in the other light source array groupsmay be electrically connected to each other and simultaneously driven.

For example, the light sources included in the first light source arraygroup 300 a may be electrically connected to each other andsimultaneously driven, and the light sources included in the secondlight source array group 300 b may be electrically connected to eachother and simultaneously driven.

As such, the plurality of the light source arrays may be disposed,thereby providing various light colors and luminous fluxes dependingupon external environments and, in addition, providing various beampatterns depending upon external environments.

FIG. 13 is a plan view showing that light sources according to a firstembodiment are electrically connected to each other.

As shown in FIG. 13, the first embodiment may include the firstsubstrate 100, the second substrate 200, and a plurality of the lightsources 300.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The light sources 300 included in the first light source array 310 maybe electrically connected to a first one electrode pattern 411 disposedon the second substrate 200.

Also, the light sources 300 included in the first light source array 310may be electrically connected to a second one electrode pattern 413disposed on the first substrate 100 via wires 400.

The light sources 300 included in the second light source array 330 maybe electrically connected to a third one electrode pattern 431 disposedon the second substrate 200.

Also, the light sources 300 included in the second light source array330 may be electrically connected to a fourth one electrode pattern 433disposed on the first substrate 100 via the wires 400.

Consequently, the neighboring first and second light source arrays 310and 330 may be electrically isolated from each other and individuallydriven.

The light sources 300 included in the first light source array 310 maybe electrically connected to each other and simultaneously driven, andthe light sources 300 included in the second light source array 330 maybe electrically connected to each other and simultaneously driven.

As such, the plurality of the light source arrays according to the firstembodiment may be individually driven in accordance with the lightsource arrays, thereby providing various luminous fluxes and beampatterns depending upon external environments.

FIGS. 14 a and 14 b are plan views showing that light sources accordingto a second embodiment are electrically to each other.

As shown in FIGS. 14 a and 14 b, the second embodiment may include thefirst substrate 100, the second substrate 200, and a plurality of thelight sources 300.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The second embodiment may include a first electrical connection type ofFIG. 14 a and a second electrical connection type of FIG. 14 b.

For example, in the first electrical connection type, as shown in FIG.14 a, the light sources 300 included in the first light source array 310may be electrically connected to the first one electrode pattern 411disposed on the second substrate 200.

Also, the light sources 300 included in the first light source array 310may be individually electrically connected to a plurality of the secondelectrode patterns 413 disposed on the first substrate 100 via the wires400.

The light sources 300 included in the second light source array 330 maybe electrically connected to the third one electrode pattern 431disposed on the second substrate 200.

Also, the light sources 300 included in the second light source array330 may be individually electrically connected to a plurality of thefourth electrode patterns 433 disposed on the first substrate 100 viathe wires 400.

Consequently, the neighboring first and second light source arrays 310and 330 may be electrically isolated from each other and individuallydriven.

Also, the light sources 300 included in the first light source array 310may be electrically isolated from each other and individually driven,and the light sources 300 included in the second light source array 330may be electrically isolated from each other and individually driven.

Also, in the second electrical connection type, as shown in FIG. 14 b,the light sources 300 included in the first light source array 310 maybe individually electrically connected to the plurality of the firstelectrode patterns 411 disposed on the second substrate 200.

Also, the light sources 300 included in the first light source array 310may be electrically connected to the second one electrode pattern 413disposed on the first substrate 100 via the wires 400.

The light sources 300 included in the second light source array 330 maybe individually electrically connected to the plurality of the thirdelectrode patterns 431 disposed on the second substrate 200.

Also, the light sources 300 included in the second light source array330 may be electrically connected to the fourth one electrode pattern433 disposed on the first substrate 100 via the wires 400.

Accordingly, the neighboring first and second light source arrays 310and 330 may be electrically isolated from each other and individuallydriven.

Also, the light sources 300 included in the first light source array 310may be electrically isolated from each other and individually driven,and the light sources 300 included in the second light source array 330may be electrically isolated from each other and individually driven.

As such, the plurality of the light source arrays according to thesecond embodiment may be individually driven in accordance with thelight source arrays and may be individually driven in accordance withlight sources, thereby providing various luminous fluxes and beampatterns depending upon external environments.

FIGS. 15 a and 15 b are plan views showing that light sources accordingto a third embodiment are electrically connected to each other.

As shown in FIGS. 15 a and 15 b, the third embodiment may include thefirst substrate 100, the second substrate 200, and a plurality of thelight sources 300.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The third embodiment may include a first electrical connection type ofFIG. 15 a and a second electrical connection type of FIG. 15 b.

For example, in the first electrical connection type, as shown in FIG.15 a, the light sources 300 included in the first light source array 310may be electrically connected to the first one electrode pattern 411disposed on the second substrate 200.

Also, the light sources 300 included in the first light source array 310may be individually electrically connected to the plurality of thesecond electrode patterns 413 disposed on the first substrate 100 viathe wires 400.

The light sources 300 included in the second light source array 330 maybe electrically connected to the third one electrode pattern 431disposed on the second substrate 200.

Also, the light sources 300 included in the second light source array330 may be electrically connected to the fourth one electrode pattern433 disposed on the first substrate 100 via the wires 400.

Consequently, the neighboring first and second light source arrays 310and 330 may be electrically isolated from each other and individuallydriven.

Also, the light sources 300 included in the first light source array 310may be electrically isolated from each other and individually driven,and the light sources 300 included in the second light source array 330may be electrically isolated from each other and simultaneously driven.

Also, in the second electrical connection type, as shown in FIG. 15 b,the light sources 300 included in the first light source array 310 maybe individually electrically connected to the plurality of the firstelectrode patterns 411 disposed on the second substrate 200.

Also, the light sources 300 included in the first light source array 310may be electrically connected to the second one electrode pattern 413disposed on the first substrate 100 via the wires 400.

The light sources 300 included in the second light source array 330 maybe electrically connected to the third one electrode pattern 431disposed on the second substrate 200.

Also, the light sources 300 included in the second light source array330 may be electrically connected to the fourth one electrode pattern433 disposed on the first substrate 100 via the wires 400.

Accordingly, the neighboring first and second light source arrays 310and 330 may be electrically isolated from each other and individuallydriven.

Also, the light sources 300 included in the first light source array 310may be electrically isolated from each other and individually driven,and the light sources 300 included in the second light source array 330may be electrically isolated from each other and simultaneously driven.

As such, in the third embodiment, the driving method of the lightsources included in the light source array may be different according tothe light source array.

That is, the light sources included in some of the light source arraysare simultaneously driven and the light sources included in the other ofthe light source arrays are individually driven, thereby providingvarious luminous fluxes and beam patterns depending upon externalenvironments.

FIGS. 16 a and 16 b are plan views showing that light sources accordingto a fourth embodiment are electrically connected to each other.

As shown in FIGS. 16 a and 16 b, the fourth embodiment may include thefirst substrate 100, the second substrate 200, and a plurality of thelight sources 300.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The fourth embodiment may include a first electrical connection type ofFIG. 16 a and a second electrical connection type of FIG. 16 b.

For example, in the first electrical connection type, as shown in FIG.16 a, the light sources 300 included in the first light source array 310may be electrically connected to the first one electrode pattern 411disposed on the second substrate 200.

Also, the light sources 300 included in the first light source array 310may be electrically connected to the one second electrode pattern 413disposed on the first substrate 100 via the wires 400.

The light sources 300 included in the second light source array 330 maybe electrically connected to the third one electrode pattern 431disposed on the second substrate 200.

Also, the light sources 300 included in the second light source array330 may be individually electrically connected to the plurality of thefourth electrode patterns 433 disposed on the first substrate 100 viathe wires 400.

Consequently, the neighboring first and second light source arrays 310and 330 may be electrically isolated from each other and individuallydriven.

Also, the light sources 300 included in the first light source array 310may be electrically isolated from each other and simultaneously driven,and the light sources 300 included in the second light source array 330may be electrically isolated from each other and individually driven.

Also, in the second electrical connection type, as shown in FIG. 16 b,the light sources 300 included in the first light source array 310 maybe electrically connected to the first one electrode pattern 411disposed on the second substrate 200.

Also, the light sources 300 included in the first light source array 310may be electrically connected to the second one electrode pattern 413disposed on the first substrate 100 via the wires 400.

The light sources 300 included in the second light source array 330 maybe individually electrically connected to the plurality of the thirdelectrode patterns 431 disposed on the second substrate 200.

Also, the light sources 300 included in the second light source array330 may be electrically connected to the fourth one electrode pattern433 disposed on the first substrate 100 via the wires 400.

Accordingly, the neighboring first and second light source arrays 310and 330 may be electrically isolated from each other and individuallydriven.

Also, the light sources 300 included in the first light source array 310may be electrically connected to each other and simultaneously driven,and the light sources 300 included in the second light source array 330may be electrically isolated from each other and individually driven.

As such, in the fourth embodiment, the driving method of the lightsources included in the light source array may be different according tothe light source array.

That is, the light sources included in some of the light source arraysare simultaneously driven and the light sources included in the other ofthe light source arrays are individually driven, thereby providingvarious luminous fluxes and beam patterns depending upon externalenvironments.

FIGS. 17 a to 17 c are plan views showing the number of the lightsources included in the light source array.

As shown in FIGS. 17 a to 17 c, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The number of the light sources 310-1 included in the first light sourcearray 310 may be equal to the number of the light sources 330-1 includedin the second light source array 330 or may be different from each otheraccording to circumstances.

For example, as shown in FIG. 17 a, the number of the light sources310-1 included in the first light source array 310 may be greater thanthe number of the light sources 330-1 included in the second lightsource array 330.

Also, as shown in FIG. 17 b, the number of the light sources 310-1included in the first light source array 310 may be less than the numberof the light sources 330-1 included in the second light source array330.

Also, as shown in FIG. 17 c, the number of the light sources 310-1included in the first light source array 310 may be equal to the numberof the light sources 330-1 included in the second light source array330.

As such, in the embodiment, the number of the light sources included inthe light source array is changed according to the light source array,thereby providing various luminous fluxes and beam patterns dependingupon external environments.

FIGS. 18 a to 18 c are views showing the luminous flux of the lightsource included in the light source array.

FIG. 18 a is a plan view showing the arrangement of the light sourcearrays. FIGS. 18 b and 18 c are cross sectional views taken along lineII-II of FIG. 18 a.

As shown in FIGS. 18 a to 18 c, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The luminous flux of the light sources 310-1 included in the first lightsource array 310 may be equal to the luminous flux of the light sources330-1 included in the second light source array 330 or may be differentfrom each other according to circumstances.

For example, as shown in FIG. 18 b, the luminous flux of the lightsources 310-1 included in the first light source array 310 may be largerthan the luminous flux of the light sources 330-1 included in the secondlight source array 330.

Also, as shown in FIG. 18 c, the luminous flux of the light sources310-1 included in the first light source array 310 may be smaller thanthe luminous flux of the light sources 330-1 included in the secondlight source array 330.

As such, in the embodiment, the luminous flux of the light sourcesincluded in the light source array is changed according to the lightsource array, thereby providing various luminous fluxes and beampatterns depending upon external environments.

FIGS. 19 a to 19 c are plan view showing the distance between the lightsources included in the light source array.

As shown in FIGS. 19 a to 19 c, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

A distance d1 between the light sources 310-1 included in the firstlight source array 310 may be equal to a distance d2 between the lightsources 330-1 included in the second light source array 330 or may bedifferent from each other according to circumstances.

For example, as shown in FIG. 19 a, the distance d1 between the lightsources 310-1 included in the first light source array 310 may be lessthan the distance d2 between the light sources 330-1 included in thesecond light source array 330.

Also, as shown in FIG. 19 b, the distance d1 between the light sources310-1 included in the first light source array 310 may be greater thanthe distance d2 between the light sources 330-1 included in the secondlight source array 330.

Also, as shown in FIG. 19 c, the distance d1 between the light sources310-1 included in the first light source array 310 may be equal to thedistance d2 between the light sources 330-1 included in the second lightsource array 330.

As such, in the embodiment, the distance between the light sourcesincluded in the light source array is changed according to the lightsource array, thereby providing various luminous fluxes and beampatterns depending upon external environments.

FIGS. 20 a and 20 b are plan views showing the distance between thelight source arrays and the distance between the light sources.

As shown in FIGS. 20 a and 20 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The light sources 310-1 included in the first light source array 310 maybe spaced apart from each other by a distance d11, the light sources330-1 included in the second light source array 330 may be spaced apartfrom each other by a distance d12, and the light sources 310-1 includedin the first light source array 310 may be spaced apart from the lightsources 330-1 included in the second light source array 330 by adistance d13.

Here, the distance d11 between the light sources 310-1 included in thefirst light source array 310 may be equal to the distance d12 betweenthe light sources 330-1 included in the second light source array 330.

Also, the distance d11 between the light sources 310-1 included in thefirst light source array 310 and the distance d12 between the lightsources 330-1 included in the second light source array 330 may be equalto the distance d13 between the light sources 310-1 included in thefirst light source array 310 and the light sources 330-1 included in thesecond light source array 330. According to circumstances, the distanced11 and the distance d12 may be different from the distance d13.

For example, as shown in FIG. 20 a, the distance d11 between the lightsources 310-1 included in the first light source array 310 may be equalto the distance d12 between the light sources 330-1 included in thesecond light source array 330, and the distance d13 between the lightsources 310-1 included in the first light source array 310 and the lightsources 330-1 included in the second light source array 330 may begreater than the distance d11 and the distance d12.

Here, a ratio of the distance d13 and the distance d11 or a ratio of thedistance d13 and the distance d12 may be about 1.1:1 to 10:1.

Also, as shown in FIG. 20 b, the distance d11 between the light sources310-1 included in the first light source array 310 may be equal to thedistance d12 between the light sources 330-1 included in the secondlight source array 330, and the distance d13 between the light sources310-1 included in the first light source array 310 and the light sources330-1 included in the second light source array 330 may be equal to thedistance d11 and the distance d12.

Here, the distance d11, the distance d12, and the distance d13 may be 10mm or more. For example, the distance d11, the distance d12, and thedistance d13 may be 40 to 80 mm.

As such, in the embodiment, the light sources are arranged such that thedistance between the light source arrays and the distance between thelight sources are mutually different, thereby providing various luminousfluxes and beam patterns depending upon external environments.

FIGS. 21 a and 21 b are plan views showing the distribution of lightsources according to the first embodiment.

As shown in FIGS. 21 a and 21 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The light sources 310-1 included in the first light source array 310 andthe light sources 330-1 included in the second light source array 330may be disposed on the same plane in parallel with each other.

According to circumstances, the light sources 310-1 included in thefirst light source array 310 and the light sources 330-1 included in thesecond light source array 330 may be disposed on different planes inparallel with each other.

As shown in FIG. 21 a, when the number of the light sources 310-1included in the first light source array 310 is equal to the number ofthe light sources 330-1 included in the second light source array 330,the light sources 310-1 included in the first light source array 310 andthe light sources 330-1 included in the second light source array 330may be disposed one to one corresponding to each other on the sameplane.

Also, as shown in FIG. 21 b, when the number of the light sources 310-1included in the first light source array 310 is different from thenumber of the light sources 330-1 included in the second light sourcearray 330, the light sources 310-1 included in the first light sourcearray 310 and the light sources 330-1 included in the second lightsource array 330 may be disposed corresponding to each other on the sameplane.

As such, in the embodiment, the light sources are arranged in parallelwith each other in accordance with the light source array, therebyproviding various luminous fluxes and beam patterns depending uponexternal environments.

FIGS. 22 a and 22 b are plan views showing the distribution of lightsources according to the second embodiment.

As shown in FIGS. 22 a and 22 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The light sources 310-1 included in the first light source array 310 andthe light sources 330-1 included in the second light source array 330may be disposed on the same plane alternately with each other.

According to circumstances, the light sources 310-1 included in thefirst light source array 310 and the light sources 330-1 included in thesecond light source array 330 may be disposed on different planesalternately with each other.

As shown in FIG. 22 a, when the number of the light sources 310-1included in the first light source array 310 is equal to the number ofthe light sources 330-1 included in the second light source array 330,the light sources 310-1 included in the first light source array 310 andthe light sources 330-1 included in the second light source array 330may be disposed alternately with each other on the same plane.

Also, as shown in FIG. 22 b, when the number of the light sources 310-1included in the first light source array 310 is different from thenumber of the light sources 330-1 included in the second light sourcearray 330, the light sources 310-1 included in the first light sourcearray 310 and the light sources 330-1 included in the second lightsource array 330 may be disposed alternately with each other on the sameplane.

As such, in the embodiment, the light sources are arranged alternatelywith each other in accordance with the light source array, therebyproviding various luminous fluxes and beam patterns depending uponexternal environments.

FIGS. 23 a and 23 b are views showing the distribution of light sourcesaccording to the third embodiment.

FIG. 23 a is a plan view showing the arrangement of the light sourcearrays. FIG. 23 b is a cross sectional views taken along line III-III ofFIG. 23 a.

As shown in FIGS. 23 a and 23 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The light sources 310-1 included in the first light source array 310 maybe disposed on a first upper surface 210 of the second substrate 200,and the light sources 330-1 included in the second light source array330 may be disposed on a second upper surface 220 of the secondsubstrate 200.

Here, the first upper surface 210 of the second substrate 200 may behigher than the second upper surface 220 of the second substrate 200. Aside surface 230 between the first upper surface 210 of the secondsubstrate 200 and the second upper surface 220 of the second substrate200 may be perpendicular to the first upper surface 210 of the secondsubstrate 200 or the second upper surface 220 of the second substrate200.

That is, an angle between the side surface 230 of the second substrate200 and the second upper surface 220 of the second substrate 200 may bea right angle.

Accordingly, the light sources 310-1 included in the first light sourcearray 310 and the light sources 330-1 included in the second lightsource array 330 may be disposed on different planes.

This is because that the first upper surface 210 of the second substrate200 is higher than the second upper surface 220 of the second substrate200.

For example, the light sources 310-1 included in the first light sourcearray 310 may be disposed on an area higher than the light sources 330-1included in the second light source array 330.

This intends that the light sources 310-1 included in the first lightsource array 310 and the light sources 330-1 included in the secondlight source array 330 are disposed on different planes as describedabove to vary light emission directions of the light sources 300,thereby realizing various beam patterns.

FIGS. 24 a to 24 c are cross sectional views showing the distribution oflight sources according to FIG. 23 b.

As shown in FIGS. 24 a to 24 c, the light sources 310-1 included in thefirst light source array 310 may be disposed on the first upper surfaceof the second substrate 200, and the light sources 330-1 included in thesecond light source array 330 may be disposed on the second uppersurface of the second substrate 200.

Here, the light sources 310-1 included in the first light source array310 and the light sources 330-1 included in the second light sourcearray 330 may be disposed on different planes.

This is because that the first upper surface of the second substrate 200is higher than the second upper surface of the second substrate 200.

Accordingly, the light sources 310-1 included in the first light sourcearray 310 may be disposed on an area higher than the light sources 330-1included in the second light source array 330.

Here, as shown in FIG. 24 a, a distance d31 between a first parallelline H1 extending from an upper surface 310-1 a of the light source310-1 included in the first light source array 310 and a second parallelline H2 extending from an upper surface 330-1 a of the light source330-1 included in the second light source array 330 may be less than adistance d32 between the upper surface 310-1 a and a lower surface 310-1b of the light source 310-1 included in the first light source array 310or between the upper surface 330-1 a and a lower surface 330-1 b of thelight source 330-1 included in the second light source array 330.

According to circumstances, as shown in FIG. 24 b, the distance d31between the first parallel line H1 extending from the upper surface310-1 a of the light source 310-1 included in the first light sourcearray 310 and the second parallel line H2 extending from the uppersurface 330-1 a of the light source 330-1 included in the second lightsource array 330 may be equal to the distance d32 between the uppersurface 310-1 a and the lower surface 310-1 b of the light source 310-1included in the first light source array 310 or between the uppersurface 330-1 a and the lower surface 330-1 b of the light source 330-1included in the second light source array 330.

In another case, as shown in FIG. 24 c, the distance d31 between thefirst parallel line H1 extending from the upper surface 310-1 a of thelight source 310-1 included in the first light source array 310 and thesecond parallel line H2 extending from the upper surface 330-1 a of thelight source 330-1 included in the second light source array 330 may begreater than the distance d32 between the upper surface 310-1 a and thelower surface 310-1 b of the light source 310-1 included in the firstlight source array 310 or between the upper surface 330-1 a and thelower surface 330-1 b of the light source 330-1 included in the secondlight source array 330.

This intends that the light sources 310-1 included in the first lightsource array 310 and the light sources 330-1 included in the secondlight source array 330 are disposed on different planes as describedabove to vary light emission directions of the light sources 300,thereby realizing various beam patterns.

FIGS. 25 a to 25 d are cross sectional views showing light emissiondirections of the light sources according to FIG. 23 b.

As shown in FIGS. 25 a to 25 d, the light sources 310-1 included in thefirst light source array 310 may be disposed on the first upper surfaceof the second substrate 200, and the light sources 330-1 included in thesecond light source array 330 may be disposed on the second uppersurface of the second substrate 200.

Here, the light sources 310-1 included in the first light source array310 and the light sources 330-1 included in the second light sourcearray 330 may be disposed on different planes.

This is because that the first upper surface of the second substrate 200is higher than the second upper surface of the second substrate 200.

Accordingly, the light sources 310-1 included in the first light sourcearray 310 may be disposed on an area higher than the light sources 330-1included in the second light source array 330.

Here, the light emission direction of the light sources 310-1 includedin the first light source array 310 may be the same as that of the lightsources 330-1 included in the second light source array 330. Accordingto circumstances, the light emission direction of the light sources310-1 included in the first light source array 310 may be different fromthat of the light sources 330-1 included in the second light sourcearray 330.

As shown in FIG. 25 a, the light sources 310-1 included in the firstlight source array 310 may emit light in a first direction, and thelight sources 330-1 included in the second light source array 330 mayemit light in a second direction perpendicular to the first direction.

Also, as shown in FIG. 25 b, the light sources 310-1 included in thefirst light source array 310 may emit light in the second direction, andthe light sources 330-1 included in the second light source array 330may emit light in the first direction.

Also, as shown in FIG. 25 c, the light sources 310-1 included in thefirst light source array 310 may emit light in a third directionopposite to the second direction, and the light sources 330-1 includedin the second light source array 330 may emit light in the firstdirection.

Also, as shown in FIG. 25 d, the light sources 310-1 included in thefirst light source array 310 may emit light in the third directionopposite to the second direction, and the light sources 330-1 includedin the second light source array 330 may emit light in the seconddirection.

As such, in the embodiment, the light emission directions of the lightsources 300 may be varied, thereby realizing various beam patterns.

FIGS. 26 a and 26 b are views showing the distribution of light sourcesaccording to the fourth embodiment.

FIG. 26 a is a plan view showing the arrangement of the light sourcearrays. FIG. 26 b is a cross sectional views taken along line IV-IV ofFIG. 26 a.

As shown in FIGS. 26 a and 26 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The light sources 310-1 included in the first light source array 310 maybe disposed on a first upper surface 210 of the second substrate 200,and the light sources 330-1 included in the second light source array330 may be disposed on a second upper surface 220 of the secondsubstrate 200.

Here, the first upper surface 210 of the second substrate 200 may behigher than the second upper surface 220 of the second substrate 200. Aside surface 230 between the first upper surface 210 of the secondsubstrate 200 and the second upper surface 220 of the second substrate200 may be tilted at a certain angle with respect to the first uppersurface 210 of the second substrate 200 or the second upper surface 220of the second substrate 200.

That is, an angle between the side surface 230 of the second substrate200 and the second upper surface 220 of the second substrate 200 may bean obtuse angle.

Accordingly, the light sources 310-1 included in the first light sourcearray 310 and the light sources 330-1 included in the second lightsource array 330 may be disposed on different planes.

This is because that the first upper surface 210 of the second substrate200 is higher than the second upper surface 220 of the second substrate200.

For example, the light sources 310-1 included in the first light sourcearray 310 may be disposed on an area higher than the light sources 330-1included in the second light source array 330.

This intends that the light sources 310-1 included in the first lightsource array 310 and the light sources 330-1 included in the secondlight source array 330 are disposed on different planes as describedabove to vary light emission directions of the light sources 300,thereby realizing various beam patterns.

FIGS. 27 a and 27 b are views showing the distribution of light sourcesaccording to a fifth embodiment.

FIG. 27 a is a plan view showing the arrangement of the light sourcearrays. FIG. 27 b is a cross sectional views taken along line V-V ofFIG. 27 a.

As shown in FIGS. 27 a and 27 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The second substrate 200 may include the first upper surface 210 and thesecond upper surface 220, and the side surface 230 between the firstupper surface 210 and the second upper surface 220.

Here, the first upper surface 210 of the second substrate 200 may behigher than the second upper surface 220 of the second substrate 200. Aside surface 230 between the first upper surface 210 of the secondsubstrate 200 and the second upper surface 220 of the second substrate200 may be tilted at a certain angle with respect to the first uppersurface 210 of the second substrate 200 or the second upper surface 220of the second substrate 200.

That is, an angle between the side surface 230 of the second substrate200 and the second upper surface 220 of the second substrate 200 may bean obtuse angle.

For example, the first light source array 310 may be supported by afirst area of the second substrate 200, the second light source array330 may be supported by a second area of the second substrate 200, andan angle between the surface of the first area of the second substrate200 facing the first light source array 310 and the surface of thesecond area of the second substrate 200 facing the second light sourcearray 330 may be about 91 to 179 degrees.

The light sources 330-1 included in the second light source array 330may be disposed on the second upper surface 220 of the second substrate200, the light sources 310-1 included in the first light source array310 may be disposed on the side surface 230 of the second substrate 200,and no light source may be disposed on the first upper surface 210 ofthe second substrate 200.

Accordingly, the light sources 310-1 included in the first light sourcearray 310 and the light sources 330-1 included in the second lightsource array 330 may be disposed on different planes.

For example, the light sources 310-1 included in the first light sourcearray 310 may be disposed on an area higher than the light sources 330-1included in the second light source array 330.

This intends that the light sources 310-1 included in the first lightsource array 310 and the light sources 330-1 included in the secondlight source array 330 are disposed on different planes as describedabove to vary light emission directions of the light sources 300,thereby realizing various beam patterns.

FIGS. 28 a and 28 b are cross sectional views showing the distributionof light sources according to FIG. 27 b.

As shown in FIGS. 28 a and 28 b, the second substrate 200 may includethe first upper surface 210 and the second upper surface 220, and theside surface 230 between the first upper surface 210 and the secondupper surface 220.

Here, the first upper surface 210 of the second substrate 200 may behigher than the second upper surface 220 of the second substrate 200. Aside surface 230 between the first upper surface 210 of the secondsubstrate 200 and the second upper surface 220 of the second substrate200 may be tilted at a certain angle with respect to the first uppersurface 210 of the second substrate 200 or the second upper surface 220of the second substrate 200.

That is, an angle between the side surface 230 of the second substrate200 and the second upper surface 220 of the second substrate 200 may bean obtuse angle.

The light sources 330-1 included in the second light source array 330may be disposed on the second upper surface 220 of the second substrate200, the light sources 310-1 included in the first light source array310 may be disposed on the side surface 230 of the second substrate 200,and no light source may be disposed on the first upper surface 210 ofthe second substrate 200.

Here, as shown in FIG. 28 a, a parallel line H3 extending from the uppersurface 330-1 a of the light source 330-1 included in the second lightsource array 330 may meet a side surface 310-1 c of the light sources310-1 included in the first light source array 310.

According to circumstances, as shown in FIG. 28 b, the parallel line H3extending from the upper surface 330-1 a of the light source 330-1included in the second light source array 330 may meet the upper surface310-1 a of the light sources 310-1 included in the first light sourcearray 310.

Accordingly, the light sources 310-1 included in the first light sourcearray 310 and the light sources 330-1 included in the second lightsource array 330 may be disposed on different planes.

For example, the light sources 310-1 included in the first light sourcearray 310 may be disposed on an area higher than the light sources 330-1included in the second light source array 330.

This intends that the light sources 310-1 included in the first lightsource array 310 and the light sources 330-1 included in the secondlight source array 330 are disposed on different planes as describedabove to vary light emission directions of the light sources 300,thereby realizing various beam patterns.

FIGS. 29 a to 29 c are cross sectional views showing light emissiondirections of the light sources according to FIG. 18 b.

As shown in FIGS. 29 a to 29 c, the second substrate 200 may include thefirst upper surface 210 and the second upper surface 220, and the sidesurface 230 between the first upper surface 210 and the second uppersurface 220.

Here, the first upper surface 210 of the second substrate 200 may behigher than the second upper surface 220 of the second substrate 200. Aside surface 230 between the first upper surface 210 of the secondsubstrate 200 and the second upper surface 220 of the second substrate200 may be tilted at a certain angle with respect to the first uppersurface 210 of the second substrate 200 or the second upper surface 220of the second substrate 200.

That is, an angle between the side surface 230 of the second substrate200 and the second upper surface 220 of the second substrate 200 may bean obtuse angle.

The light sources 330-1 included in the second light source array 330may be disposed on the second upper surface 220 of the second substrate200, the light sources 310-1 included in the first light source array310 may be disposed on the side surface 230 of the second substrate 200,and no light source may be disposed on the first upper surface 210 ofthe second substrate 200.

Here, as shown in FIG. 29 a, the light sources 330-1 included in thesecond light source array 330 may emit light in a first direction, andthe light sources 310-1 included in the first light source array 310 mayemit light in a third direction forming a predetermined angle with thefirst direction.

The reason that the light sources 310-1 included in the first lightsource array 310 emit light in the third direction is that the lightsources 310-1 included in the first light source array 310 are disposedon the inclined side surface of the second substrate 200.

As shown in FIG. 29 b, the light sources 330-1 included in the secondlight source array 330 may emit light in the first direction, and thelight sources 310-1 included in the first light source array 310 mayemit light in a fourth direction forming a predetermined angle with thefirst direction.

Also, as shown in FIG. 29 c, the light sources 330-1 included in thesecond light source array 330 may emit light in a second directionperpendicular to the first direction, and the light sources 310-1included in the first light source array 310 may emit light in thefourth direction.

As such, in the embodiment, the light emission directions of the lightsources may be varied, thereby realizing various beam patterns.

FIGS. 30 a and 30 b are views showing the distribution of light sourcesaccording to a sixth embodiment.

FIG. 30 a is a plan view showing the arrangement of the light sourcearrays. FIG. 30 b is a cross sectional views taken along line VI-VI ofFIG. 30 a.

As shown in FIGS. 30 a and 30 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include the first,second, and third light source arrays 310, 330 and 350.

The second substrate 200 may include the first upper surface 210 and thesecond upper surface 220, and the side surface 230 between the firstupper surface 210 and the second upper surface 220.

Here, the first upper surface 210 of the second substrate 200 may behigher than the second upper surface 220 of the second substrate 200. Aside surface 230 between the first upper surface 210 of the secondsubstrate 200 and the second upper surface 220 of the second substrate200 may be tilted at a certain angle with respect to the first uppersurface 210 of the second substrate 200 or the second upper surface 220of the second substrate 200.

That is, an angle between the side surface 230 of the second substrate200 and the second upper surface 220 of the second substrate 200 may bean obtuse angle.

Light sources 350-1 included in the third light source array 350 may bedisposed on the first upper surface 210 of the second substrate 200, thelight sources 310-1 included in the first light source array 310 may bedisposed on the side surface 230 of the second substrate 200, and thelight sources 330-1 included in the second light source array 330 may bedisposed on the second upper surface 220 of the second substrate 200.

Accordingly, the light sources 310-1 included in the first light sourcearray 310, the light sources 330-1 included in the second light sourcearray 330, and the light sources 350-1 included in the third lightsource array 350 may be disposed on different planes.

For example, the light sources 310-1 included in the first light sourcearray 310 may be disposed on an area higher than the light sources 330-1included in the second light source array 330, the light sources 350-1included in the third light source array 350 may be disposed on an areahigher than the light sources 310-1 included in the first light sourcearray 310 and the light sources 330-1 included in the second lightsource array 330.

This intends that the light sources 310-1 included in the first lightsource array 310, the light sources 330-1 included in the second lightsource array 330, and the light sources 350-1 included in the thirdlight source array 350 are disposed on different planes as describedabove to vary light emission directions of the light sources 300,thereby realizing various beam patterns.

FIGS. 31 a to 31 c are views showing the structure of the light sourceaccording to the embodiment.

FIG. 31 a is a plan view showing the arrangement of the light sourcearrays. FIG. 31 b is a cross sectional view showing the structure of atop view type light source. FIG. 31 c is a cross sectional view showingthe structure of a side view type light source.

As shown in FIG. 31 a, the first substrate 100, the second substrate200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

The light sources 310-1 included in the first light source array 310 andthe light sources 330-1 included in the second light source array 330may be top view type light emitting diodes. According to circumstances,a plurality of the light sources 300 may be side view type lightemitting diodes.

In another case, the plurality of the light sources 300 may be formed bymixing the top view type light emitting diodes and the side view typelight emitting diodes.

For example, the light sources 310-1 included in the first light sourcearray 310 are top view type light emitting diodes including a firstelectrode disposed on a light emitting structure, a second electrodedisposed under the light emitting structure, and a reflective layerdisposed between the second electrode and the light emitting structure.

Also, the light sources 330-1 included in the second light source array330 are side view type light emitting diodes including the first and thesecond electrodes disposed on the light emitting structure and atransparent substrate disposed under the light emitting structure.

As shown in FIG. 31 b, the top view type light source may include asupport substrate 70, a coupling layer 75 disposed on the supportsubstrate 70, a reflective layer 60, an ohmic layer 50, and a lightemitting structure 20 disposed on the support substrate 70.

Here, the support substrate 70 may be a conductive substrate. Thesupport substrate 70 may be formed of a material having high electricalconductivity and high thermal conductivity.

The coupling layer 75 may include barrier metal or bonding metal. Forexample, the coupling layer 75 may include at least one of Ti, Au, Sn,Ni, Cr, Ga, In, Bi, Cu, Ag, and Ta. However, there is no limit to this.

The reflective layer 60 may be formed of, for example, any one selectedfrom the group consisting of Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au,Hf, and through a selective combination thereof. Alternatively, thereflective layer 60 may be formed in the form of multi-layers by using ametallic material and a light-transmitting conductive material.

Also, the reflective layer 60 may be formed by stacking IZO/Ni, AZO/Ag,IZO/Ag/Ni, AZO/Ag/Ni, etc.

When the reflective layer 60 is formed of a material which comes inohmic contact with the light emitting structure, the ohmic layer 50 isnot necessary to be formed. There is no limit to this.

As such, the reflective layer 60 is able to greatly improve lightextraction efficiency of the light source by effectively reflectinglight generated from an active layer 24 of the light emitting structure.

The light-transmitting conductive material and the metallic material maybe selectively used to form the ohmic layer 50. For example, the ohmiclayer 50 may be formed of at least one selected from the groupconsisting of indium tin oxide (ITO), indium zinc oxide (IZO), indiumzinc tin oxide (IZTO), indium aluminum zinc oxide (IAZO), indium galliumzinc oxide (IGZO), indium gallium tin oxide (IGTO), aluminum zinc oxide(AZO), antimony tin oxide (ATO), gallium zinc oxide (GZO), IZO Nitride(IZON), Al—Ga ZnO (AGZO), In—Ga ZnO (IGZO), ZnO, IrOx, RuOx, NiO,RuOx/ITO, Ni/IrOx/Au, Ni/IrOx/Au/ITO, Ag, Ni, Cr, Ti, Al, Rh, Pd, Ir,Sn, In, Ru, Mg, Zn, Pt, Au, and Hf However, the material of the ohmiclayer 50 is not limited to this.

The light emitting structure 20 may include a first conductivesemiconductor layer 22, the active layer 24, and a second conductivesemiconductor layer 26.

Here, the first conductive semiconductor layer 22 may be formed of asemiconductor compound, such as a Group III-V or II-VI compoundsemiconductor.

When the first conductive semiconductor layer 22 is an n typesemiconductor layer, a first conductive dopant may be an n type dopant,such as Si, Ge, Sn, Se, or Te. However, there is no limit to this.

The active layer 24 is a layer in which electrons injected through thefirst conductive semiconductor layer 22 encounter electron holesinjected through the second conductive semiconductor layer 26, so thatlight is emitted from the active layer 24.

Here, the active layer 24 may be formed to have at least any one of asingle well structure, a multiple well structure, a quantum wirestructure, and a quantum dot structure.

For example, the active layer 24 may have the multiple quantum wellstructure formed by injecting trimethylgallium (TMGa), ammonia (NH3),nitrogen (N2), and trimethylindium (TMIn). However, there is no limit tothis.

Also, a well layer/barrier layer of the active layer 24 may be formed ina pair structure of at least one of InGaN/GaN, InGaN/InGaN, GaN/AlGaN,InAlGaN/GaN, GaAs(InGaAs)/AlGaAs, and GaP(InGaP)/AlGaP. However,embodiments are not limited thereto.

A conductive clad layer (not shown) may be formed on and/or under theactive layer 24. The conductive clad layer may be formed of asemiconductor having a band gap larger than that of the barrier layer ofthe active layer 24.

For example, the conductive clad layer may include GaN, AlGaN, InAlGaNor a superlattice structure. The conductive clad layer may be n-type orp-type doped.

Also, the second conductive semiconductor layer 26 may be formed of asemiconductor compound, such as a Group III-V compound semiconductordoped with a second conductive dopant.

Here, the second conductive semiconductor layer 26 may include asemiconductor material having an empirical formula of, for example,In_(x)Al_(y)Ga_(1-x-y)N (0≦x≦1, 0≦y≦1, 0≦x+y≦1).

When the second conductive semiconductor layer 26 is a p typesemiconductor layer, the second conductive dopant is a p type dopant,including Mg, Zn, Ca, Sr, or Ba. However, there is no limit to this.

Here, the first conductive semiconductor layer 22 may include a p typesemiconductor layer, and the second conductive semiconductor layer 26may include an n type semiconductor layer.

Also, a third conductive semiconductor layer (not shown) including an ntype or p type semiconductor layer may be formed on the first conductivesemiconductor layer 22. Therefore, the light source according to theembodiment may include at least one of n-p, p-n, n-p-n, and p-n-pjunction structures.

An uneven pattern may be formed on the surface of the first conductivesemiconductor layer 22.

Here, the uneven pattern may be provided to improve external extractionefficiency of light generated from the active layer 24. The unevenpattern may have a regular cycle or an irregular cycle.

Also, a passivation layer 80 may be formed on a side surface of thelight emitting structure 20 and at least a portion of the firstconductive semiconductor layer 22.

Here, the passivation layer 80 may be formed of an insulation material,such as a nonconductive oxide or nitride, to protect the light emittingstructure 20.

As an example, the passivation layer 80 may be formed of a silicon oxide(SiO₂) layer, an oxide-nitride layer, or an aluminum oxide layer.

Meanwhile, as shown in FIG. 31 c, a top view type light source mayinclude the light emitting structure 20 including the first conductivesemiconductor layer 22 disposed on a substrate 10, the active layer 24,and the second conductive semiconductor layer 26.

The light emitting structure 20 may be formed by using, for example,metal organic chemical vapor deposition (MOCVD), chemical vapordeposition (CVD), plasma-enhanced chemical vapor deposition (PECVD),molecular beam epitaxy (MBE), hydride vapor phase epitaxy (HVPE) and thelike. However, the method for forming the light emitting structure 20 isnot limited to this.

The substrate 10 may be formed of a material suitable for the growth ofa semiconductor material or may be formed of a carrier wafer.

Also, the substrate 10 may be formed of a material having high thermalconductivity. The substrate 10 may be a conductive substrate or aninsulating substrate.

A buffer layer (not shown) may be grown between the light emittingstructure 20 and the substrate 10 to reduce lattice mismatch ofmaterials and the difference between coefficients of thermal expansion.

The buffer layer may be formed of a Group III-V compound semiconductor.For example, the buffer layer may be formed of at least one of GaN, InN,AlN, InGaN, AlGaN, InAlGaN, and AlInN.

An undoped semiconductor layer may be formed on the buffer layer.However, there is no limit to this.

A portion of the first conductive semiconductor layer 22 of the lightemitting structure 20 may be mesa-etched. A first electrode 30 may bedisposed on an opening surface formed by mesa-etching. A secondelectrode 40 may be disposed on the second conductive semiconductorlayer 26.

Here, the first electrode 30 and the second electrode 40 may be formedto have a single layer or a multiple layer structure including at leastone selected from the group consisting of aluminum (Al), titanium (Ti),chrome (Cr), nickel (Ni), copper (Cu), and gold (Au).

As such, the light sources having different light emitting structuresmay be variously disposed in the first light source array 310 and thesecond light source array 330, thereby realizing various beam patterns.

FIGS. 32 a and 32 b are plan views showing the light color distributionof the light source array according to the embodiment.

As shown in FIGS. 32 a and 32 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

For example, as shown in FIG. 32 a, an odd number of the light sourcearrays may be provided. A first light source array 310, a second lightsource array 330, and a third light source arrays 350 may be disposed onthe second substrate 200 in three rows in parallel with one another.

Here, the light sources included in the first light source array 310 mayemit first color light, the light sources included in the second lightsource array 330 may emit second color light, and the light sourcesincluded in the third light source array 350 may emit third color light.

For example, the light sources included in the first light source array310 may emit red color light, the light sources included in the secondlight source array 330 may emit white color light, and the light sourcesincluded in the third light source array 350 may emit yellow colorlight.

As shown in FIG. 32 b, an odd number of the light source arrays may beprovided. A first light source array 310, a second light source array330, and a third light source arrays 350 may be disposed on the secondsubstrate 200 in three rows in parallel with one another.

Here, the light sources included in the first light source array 310 mayemit a plurality of color lights, the light sources included in thesecond light source array 330 may emit a plurality of color lights, andthe light sources included in the third light source array 350 may emita plurality of color lights.

In this case, neighboring ones of the light sources included in thefirst light source array 310 may emit mutually different color lights,and neighboring ones of the light sources included in the second lightsource array 330 may emit mutually different color lights.

According to circumstances, the light source included in the first lightsource array 310 may emit the same color light as the color lightemitted from the neighboring ones of the light sources included in thesecond light source array 330.

In another example, the light source included in the first light sourcearray 310 may emit the color light different from the color lightemitted from the neighboring ones of the light sources included in thesecond light source array 330.

As described above, the light sources included in the light source arraymay generate the same color light, and, according to circumstances, atleast one of the light sources included in the light source array maygenerate color light different from those generated from the other lightsources.

Accordingly, in the embodiment, the light sources generating variouscolor lights may be disposed in various ways in the light source arrays,thereby realizing beam patterns having various colors.

FIGS. 33 a to 33 c are cross sectional views showing the luminous fluxof the light sources included in the light source array. Morespecifically, FIGS. 33 a to 33 c are cross sectional views taken alongline I-I of FIG. 11 a.

As shown in FIGS. 11 a and 33 a to 33 c, the first substrate 100, thesecond substrate 200, and a plurality of the light sources 300 may beincluded.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

The light source arrays may include neighboring first and second lightsource arrays 310 and 330.

The light sources included in the light source array may be disposed ina first area which is the central area of the second substrate 200, in asecond area which is the edge area of the second substrate 200, and in athird area between the central area and the edge area of the secondsubstrate 200.

For example, as shown in FIG. 33 a, the luminous flux of the lightsource 330-1 located in the first area of the second substrate 200 amongthe plurality of the light sources included the second light sourcearray 330 may be the largest, and the luminous flux of a light source330-2 located in the second area of the second substrate 200 may be thesmallest.

Also, the luminous flux of a light source 330-3 located in the thirdarea of the second substrate 200 may be less than that of the lightsource 330-1 located in the first area of the second substrate 200 andmay be larger than that of the light source 330-2 located in the secondarea of the second substrate 200.

As shown in FIG. 33 b, the luminous flux of the light source 330-1located in the first area of the second substrate 200 among theplurality of the light sources included the second light source array330 may be the smallest, and the luminous flux of the light source 330-2located in the second area of the second substrate 200 may be thelargest.

Also, the luminous flux of the light source 330-3 located in the thirdarea of the second substrate 200 may be larger than that of the lightsource 330-1 located in the first area of the second substrate 200 andmay be smaller than that of the light source 330-2 located in the secondarea of the second substrate 200.

As shown in FIG. 33 c, the luminous flux of the light source 330-3located in the third area of the second substrate 200 among theplurality of the light sources included the second light source array330 may be larger than that of the light source 330-2 located in thesecond area of the second substrate 200.

Also, the luminous flux of the light source 330-3 located in the thirdarea of the second substrate 200 may be larger than that of the lightsource 330-1 located in the first area of the second substrate 200.

According to circumstances, the luminous flux of the light source 330-1located in the first area of the second substrate 200 may be equal tothat of the light source 330-2 located in the second area of the secondsubstrate 200.

As described above, in the light sources 300 included in the lightsource array, the luminous flux of the light source 300 disposed in thecentral area of the light source array may or may not be equal to theluminous flux of the light source 300 disposed in the edge area of thelight source array in accordance with circumstances.

For example, the luminous flux of the light source 300 disposed in thecentral area of the light source array may be larger than the luminousflux of the light source 300 disposed in the edge area of the lightsource array.

This intends that the luminance of the central area is increased in thebeam pattern emitted to the outside.

Accordingly, in the embodiment, the light sources having differentluminous fluxes may be disposed in the light source array in variousways, thereby realizing various beam patterns.

FIGS. 34 a and 34 b are cross sectional views showing the distancebetween the light sources included in the light source array. FIGS. 34 aand 34 b are cross sectional views taken along line I-I of FIG. 11 a.

As shown in FIGS. 11 a, 34 a and 34 b, the first substrate 100, thesecond substrate 200, and a plurality of the light sources 300 may beincluded.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

The light source arrays may include neighboring first and second lightsource arrays 310 and 330.

Also, the distances between the light sources 300 included in the lightsource array may or may not be the same as each other according tocircumstances.

For example, the distance between the light sources 300 included in thelight source array may be gradually increased from the central area tothe edge area of the light source array.

This intends that the luminance of the central area is increased in thebeam pattern emitted to the outside.

For example, as shown in FIG. 34 a, in the plurality of the lightsources included the second light source array 330, a distance d51between the light source 330-1 located in the central area of the secondsubstrate 200 and the light source 330-3 adjacent to the light source330-1 may be less than a distance d52 between the light source 330-2located in the edge area of the second substrate 200 and the lightsource 330-3 adjacent to the light source 330-2.

As shown in FIG. 34 b, in the plurality of the light sources includedthe second light source array 330, the distance d51 between the lightsource 330-1 located in the central area of the second substrate 200 andthe light source 330-3 adjacent to the light source 330-1 may be greaterthan the distance d52 between the light source 330-2 located in the edgearea of the second substrate 200 and the light source 330-3 adjacent tothe light source 330-2.

As such, in the embodiment, the light source arrays having differentdistances between light sources may be disposed in various ways, therebyrealizing various beam patterns.

FIGS. 35 a and 35 b are cross sectional views showing the distributionof the light sources included in the light source array according to thefirst embodiment. FIGS. 35 a and 35 b are cross sectional views takenalong line I-I of FIG. 11 a.

As shown in FIGS. 11 a, 35 a and 35 b, the first substrate 100, thesecond substrate 200, and a plurality of the light sources 300 may beincluded.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

The light source arrays may include neighboring first and second lightsource arrays 310 and 330.

The light sources 300 included in the light source array may be disposedon the same plane. According to circumstances, at least any one of thelight sources 300 included in the light source array may be disposed ona plane different from the plane on which the other light sources 300are disposed.

The light sources 300 included in the light source array may be disposedin a first area 260 which is the central area of the second substrate200 and in a second area 250 which is the edge area of the secondsubstrate 200.

For example, as shown in FIG. 35 a, the light sources 330-1 and 330-3located in the first area 260 of the second substrate 200 among theplurality of the light sources included the second light source array330 may be disposed lower than the light sources 330-2 located in thesecond area 250 of the second substrate 200.

That is, the second area 250 of the second substrate 200 may protrudefrom the first area 260 of the second substrate 200 by a certain height.

As shown in FIG. 35 b, the light sources 330-1 and 330-3 located in thefirst area 260 of the second substrate 200 among the plurality of thelight sources included the second light source array 330 may be disposedhigher than the light sources 330-2 located in the second area 250 ofthe second substrate 200.

That is, the first area 260 of the second substrate 200 may protrudefrom the second area 250 of the second substrate 200 by a certainheight.

As such, the light sources included in the light source array aredisposed on mutually different planes, thereby realizing various beampatterns.

FIGS. 36 a to 36 c are cross sectional views showing the distribution ofthe light sources included in the light source array according to thesecond embodiment. FIGS. 36 a to 36 c are cross sectional views takenalong line I-I of FIG. 11 a.

As shown in FIGS. 11 a, 36 a and 36 b, the first substrate 100, thesecond substrate 200, and a plurality of the light sources 300 may beincluded.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

The light source arrays may include neighboring first and second lightsource arrays 310 and 330.

The light sources 300 included in the light source array may be disposedon the same plane. According to circumstances, at least any one of thelight sources 300 included in the light source array may be disposed ona plane different from the plane on which the other light sources 300are disposed.

The light sources 300 included in the light source array may be disposedin the first area 260 which is the central area of the second substrate200, in the second area 250 which is the edge area of the secondsubstrate 200, and in a third area 270 between the central area and theedge area of the second substrate 200.

Here, the third area 270 of the second substrate 200 may be tilted at acertain angle with respect to the second area 250 of the secondsubstrate 200.

That is, an angle between the third area 270 of the second substrate 200and the second area 250 of the second substrate 200 may be an obtuseangle.

For example, as shown in FIG. 36 a, the light source 330-1 located inthe first area 260 of the second substrate 200 among the plurality ofthe light sources included the second light source array 330 may bedisposed higher than the light source 330-2 located in the second area250 of the second substrate 200 and the light source 330-3 located inthe third area 270 of the second substrate 200.

Also, the light source 330-2 located in the second area 250 of thesecond substrate 200 may be disposed lower than the light source 330-3located in the third area 270 of the second substrate 200.

The light sources 300 included in the light source array may have thesame light emission direction. According to circumstances, at least oneof the light sources 300 included in each light source array may have alight emission direction different from that of the other light sources300.

For example, as shown in FIG. 36 b, among the plurality of the lightsources included the second light source array 330, the light emissiondirection of the light source 330-1 located in the first area 260 of thesecond substrate 200 may be the same as that of the light source 330-2located in the second area 250 of the second substrate 200, however, maybe different from that of the light source 330-3 located in the thirdarea 270 of the second substrate 200.

The light sources 300 included in the light source array may have thesame luminous flux. According to circumstances, at least one of thelight sources 300 included in the light source array may have a luminousflux different from that of the other light sources 300.

For example, as shown in FIG. 36 c, among the plurality of the lightsources included the second light source array 330, the luminous flux ofthe light source 330-1 located in the first area 260 of the secondsubstrate 200 may be equal to that of the light source 330-2 located inthe second area 250 of the second substrate 200, however, may be smallerthan that of the light source 330-3 located in the third area 270 of thesecond substrate 200.

As such, the light sources included in the light source array aredisposed on mutually different planes, thereby realizing various beampatterns.

FIGS. 37 a to 37 e are cross sectional views showing the substratestructure of the lamp unit according to the embodiment.

As shown in FIGS. 37 a to 37 e, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

As shown in FIG. 37 a, the area of the second substrate 200 may be lessthan that of the first substrate 100.

Here, the first substrate 100 may be a metal substrate having a firstthermal conductivity. The second substrate 200 may be an insulatingsubstrate having a second thermal conductivity.

Here, the first thermal conductivity of the first substrate 100 may begreater than the second thermal conductivity of the second substrate200.

This intends that heat generated from the light source 300 disposed onthe second substrate 200 may be rapidly discharged to the outside.

Also, the first substrate 100 may be a heat dissipation plate havinghigh thermal conductivity. The first substrate 100 may be made of anyone selected from the group consisting of copper (Cu), aluminum (Al),silver (Ag), gold (Au), or of an alloy thereof.

The second substrate 200 may be made of a nitride, such as AlN,exhibiting high thermal conductivity.

As shown in FIG. 37 b, the area of the second substrate 200 may be equalto that of the first substrate 100.

That is, the first substrate 100 and the second substrate 200 may besequentially stacked to form a laminated structure.

Here, the first substrate 100 may include at least any one of Al, Cu,and Au, and the second substrate 200 may include an anodized layer.

Also, as shown in FIG. 37 c, the first substrate 100 may include acavity 102 formed in a predetermined area thereof, and the secondsubstrate 200 may be disposed in the cavity 102 of the first substrate100.

In this case, the first substrate 100 may include at least one of Al,Cu, and Au, and the second substrate 200 may include AlN.

As shown in FIG. 37 d, the second substrate 200 may include a cavity 202formed in a predetermined area thereof and may be disposed on the firstsubstrate 100.

Here, the plurality of the light sources 300 may be disposed in thecavity 202 of the second substrate 200.

In this case, the first substrate 100 may include at least one of Al,Cu, and Au, and the second substrate 200 may include AlN.

As shown in FIG. 37 e, the first substrate 100 and the second substrate200 may be formed of the same material. In this case, the firstsubstrate 100 and the second substrate 200 may include at least one ofAlN, Al, Cu, and Au.

As such, in the embodiment, the first substrate 100 and the secondsubstrate 200 may be formed in various shapes.

FIGS. 38 a to 38 c are cross sectional views showing the top surface ofa second substrate.

As shown in FIGS. 38 a to 38 c, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The area of the second substrate 200 may be less than that of the firstsubstrate 100.

Here, the first substrate 100 may be a metal substrate having a firstthermal conductivity. The second substrate 200 may be an insulatingsubstrate having a second thermal conductivity.

Here, the first thermal conductivity of the first substrate 100 may begreater than the second thermal conductivity of the second substrate200.

This intends that heat generated from the light source 300 disposed onthe second substrate 200 may be rapidly discharged to the outside.

Also, the first substrate 100 may be a heat dissipation plate havinghigh thermal conductivity. The first substrate 100 may be made of anyone selected from the group consisting of copper (Cu), aluminum (Al),silver (Ag), gold (Au), or of an alloy thereof.

The second substrate 200 may be made of a nitride, such as AlN,exhibiting high thermal conductivity.

As shown in FIG. 38 a, the second substrate 200 may have a concave uppersurface 206, on which the light source 300 is disposed.

According to circumstances, as shown in FIG. 38 b, the second substrate200 may have a convex upper surface 206, on which the light source 300is disposed. Also, as shown in FIG. 38 c, the second substrate 200 mayhave a flat upper surface 206, on which the light source 300 isdisposed.

As such, the light sources are disposed on the second substrate 200having various surface shapes, thereby realizing various beam patterns.

FIGS. 39 a to 39 c are cross sectional views showing the side of thesecond substrate.

As shown in FIGS. 39 a to 39 c, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

As shown in FIG. 39 a, an angle between a side surface 205 of the secondsubstrate 200 and an upper surface 103 of the first substrate 100 may bea right angle.

According to circumstances, as shown in FIG. 39 b, an angle between theside surface 205 of the second substrate 200 and the upper surface 103of the first substrate 100 may be an obtuse angle. Alternatively, asshown in FIG. 39 c, an angle between the side surface 205 of the secondsubstrate 200 and the upper surface 103 of the first substrate 100 maybe an acute angle.

As such, in the embodiment, the first substrate 100 and the secondsubstrate 200 may be formed in various shapes.

FIGS. 40 a to 40 c are cross sectional views showing protrusions of thesecond substrate according to the first embodiment.

As shown in FIGS. 40 a to 40 c, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The area of the second substrate 200 may be less than that of the firstsubstrate 100.

Here, the first substrate 100 may be a metal substrate having a firstthermal conductivity. The second substrate 200 may be an insulatingsubstrate having a second thermal conductivity.

Here, the first thermal conductivity of the first substrate 100 may begreater than the second thermal conductivity of the second substrate200.

This intends that heat generated from the light source 300 disposed onthe second substrate 200 may be rapidly discharged to the outside.

For example, the first substrate 100 may be a heat dissipation platehaving high thermal conductivity. The first substrate 100 may be made ofany one selected from the group consisting of copper (Cu), aluminum(Al), silver (Ag), gold (Au), or of an alloy thereof.

The second substrate 200 may be made of a nitride, such as AlN,exhibiting high thermal conductivity.

The second substrate 200 may include at least one projection protrudingfrom the surface thereof by a predetermined height.

An angle between the surface of the second substrate 200 and a side ofthe projection may be a right angle.

For example, as shown in FIG. 40 a, the second substrate 200 may includea first projection 255 and a second projection 257 which protrude fromthe central area thereof by a predetermined height.

Here, the second projection 257 may protrude from the central area ofthe first projection 255 by a predetermined height.

The light source 300 may be disposed on at least any one of the secondsubstrate 200, the first projection 255, and the second projection 257.

Also, as shown in FIG. 40 b, the second substrate 200 may include thefirst projection 255 protruding from the edge area thereof by apredetermined height.

The light source 300 may be disposed on at least any one of the secondsubstrate 200 and the first projection 255.

As shown in FIG. 40 c, the second substrate 200 may include the firstprojection 255 protruding from the central area thereof by apredetermined height.

The light source 300 may be disposed on at least any one of the secondsubstrate 200 and the first projection 255.

As such, the light sources are disposed on the second substrate 200having the projections, thereby realizing various beam patterns.

FIGS. 41 a and 41 b are cross sectional views showing protrusions of thesecond substrate according to the second embodiment.

As shown in FIGS. 41 a and 41 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The second substrate 200 may include at least one projection 255protruding from the surface 206 thereof by a predetermined height.

An angle between the upper surface 206 of the second substrate 200 and aside surface 205-1 of the first projection 255 may be a right angle oran obtuse angle.

As shown in FIG. 41 a, the second substrate 200 may include the firstprojection 255 protruding from the central area thereof by apredetermined height.

Here, an angle between the upper surface 206 of the second substrate 200and the side surface 205-1 of the first projection 255 may be a rightangle.

The light source 300 may be disposed on at least any one of the secondsubstrate 200 and the first projection 255.

As shown in FIG. 41 b, the second substrate 200 may include the firstprojection 255 protruding from the central area thereof by apredetermined height.

Here, an angle between the upper surface 206 of the second substrate 200and the side surface 205-1 of the first projection 255 may be an obtuseangle.

The light source 300 may be disposed on at least any one of the secondsubstrate 200 and the first projection 255.

FIG. 42 is a cross sectional view showing protrusions of the secondsubstrate according to the third embodiment.

As shown in FIG. 42, the first substrate 100, the second substrate 200,and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The second substrate 200 may include at least one projection 255protruding from the surface 206 thereof by a predetermined height.

Here, an angle between the upper surface 206 of the second substrate 200and the side surface 205-1 of the first projection 255 may be an obtuseangle.

The light source 300 may be disposed on at least any one of the secondsubstrate 200, the upper surface of the first projection 255, and theside surface 205-1 of the first projection 255.

As such, the light sources are disposed on the second substrate 200having the projections, thereby realizing various beam patterns.

FIGS. 43 a and 43 b are views showing the barrier of the lamp unitaccording to the embodiment.

FIG. 43 a is a plan view and FIG. 43 b is a cross sectional view takenalong line VII-VII of FIG. 43 a.

As shown in FIGS. 43 a and 43 b, the first substrate 100, the secondsubstrate 200, and a plurality of the light sources 300 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The embodiment may include a plurality of light source arrays, in eachof which the plurality of the light sources 300 are disposed in a row.

Here, the plurality of the light source arrays may include theneighboring first and second light source arrays 310 and 330.

A barrier 500 may be disposed around the plurality of the light sources300.

The barrier 500 may be provided to protect the light sources 300 andwires for electrical connection of the light sources 300. The barrier500 may be formed in various shapes based on the shape of the secondsubstrate 200.

For example, the barrier 500 may be formed in a polygonal shape or aring shape.

The barrier 500 may include a metallic reflective material. The barriermay reflect light generated from the light source 300 to improve lightextraction efficiency of the light source 300.

Here, the barrier 500 may include at least one of aluminum (Al), silver(Ag), platinum (Pt), rhodium (Rh), radium (Rd), palladium (Pd), andchrome (Cr).

Subsequently, the distance between the barrier 500 and the light source300 and the height of the barrier 500 may be adjusted to control anorientation angle of light emitted from the light source 300.

FIGS. 44 a to 44 d are cross sectional views showing the distribution ofthe barrier of the lamp unit according to the embodiment.

As shown in FIGS. 44 a to 44 d, the first substrate 100, the secondsubstrate 200, a plurality of the light sources 300 and the barrier 500may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

As shown in FIG. 44, the area of the second substrate 200 may be lessthan that of the first substrate 100.

In this case, the barrier 500 may be disposed on the first substrate100.

Here, the first substrate 100 may be a metal substrate having a firstthermal conductivity. The second substrate 200 may be an insulatingsubstrate having a second thermal conductivity.

Here, the first thermal conductivity of the first substrate 100 may begreater than the second thermal conductivity of the second substrate200.

This intends that heat generated from the light source 300 disposed onthe second substrate 200 may be rapidly discharged to the outside.

For example, the first substrate 100 may be a heat dissipation platehaving high thermal conductivity. The first substrate 100 may be made ofany one selected from the group consisting of copper (Cu), aluminum(Al), silver (Ag), gold (Au), or of an alloy thereof.

The second substrate 200 may be made of a nitride, such as AlN,exhibiting high thermal conductivity.

As shown in FIG. 44 b, the area of the second substrate 200 may be equalto that of the first substrate 100.

That is, the first substrate 100 and the second substrate 200 may besequentially stacked to form a laminated structure.

In this case, the barrier 500 may be disposed on the second substrate200.

Here, the first substrate 100 may include at least any one of Al, Cu,and Au, and the second substrate 200 may include an anodized layer.

Also, as shown in FIG. 44 c, the first substrate 100 may include acavity 102 formed in a predetermined area thereof, and the secondsubstrate 200 may be disposed in the cavity 102 of the first substrate100.

In this case, the barrier 500 may be disposed on the first substrate100.

In this case, the first substrate 100 may include at least one of Al,Cu, and Au, and the second substrate 200 may include AlN.

As shown in FIG. 44 d, the second substrate 200 may include a cavity 202formed in a predetermined area thereof and may be disposed on the firstsubstrate 100.

Here, the plurality of the light sources 300 may be disposed in thecavity 202 of the second substrate 200.

In this case, the second substrate 200 may include a barrier area.

In this case, the first substrate 100 may include at least one of Al,Cu, and Au, and the second substrate 200 may include AlN.

As such, in the embodiment, the barrier may be disposed at differentpositions depending on the various shapes of the first substrate 100 andthe second substrate 200.

FIGS. 45 a and 45 b are cross sectional views showing the cover glass ofthe lamp unit according to the embodiment.

As shown in FIGS. 45 a and 45 b, the first substrate 100, the secondsubstrate 200, a plurality of light sources 300, the barrier 500, and acover glass 550 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The cover glass 550 may be spaced apart from the plurality of the lightsources 300 by a predetermined distance.

Here, a distance d60 between the light sources 300 and a lower surface550-1 of the cover glass 550 may be about 0.1 mm to 50 mm.

The cover glass may protect the light source 300 and transmit lightgenerated from the light source 300.

The cover glass 550 may be anti-reflectively coated to improve thetransmittance of the light generated from the light source 300.

Here, an anti-reflective coating film may be attached to a glass-basedmaterial, or an anti-reflective coating solution may be applied to aglass-based material by spin coating or spray coating to form ananti-reflective coating layer, so that the anti-reflective coating maybe performed.

For example, the anti-reflective coating layer may include at least oneof TiO₂, SiO₂, Al₂O₃, Ta₂O₃, ZrO₂, and MgF₂.

The cover glass 550 may include a hole (not shown) or an opening (notshown). Gas caused by heat generated from the light source 300 may bedischarged through the hole or the opening.

The cover glass 550 may be formed in the shape of a dome having a holeor an opening. According to circumstances, the cover glass 550 mayinclude a color filter which transmits only light having a specificwavelength among the light generated from the light source 300.

In another case, the cover glass may include a particular pattern (notshown) capable of adjusting an orientation angle of the light generatedfrom the light source 300.

Here, the kind and shape of the pattern are not limited.

As shown in FIG. 45 a, the area of the second substrate 200 may be lessthan that of the first substrate 100.

In this case, the barrier 500 may be disposed on the first substrate100, and the cover glass 550 may be supported by a portion of an uppersurface 500-1 of the barrier 500.

Here, the first substrate 100 may be a metal substrate having a firstthermal conductivity. The second substrate 200 may be an insulatingsubstrate having a second thermal conductivity.

Here, the first thermal conductivity of the first substrate 100 may begreater than the second thermal conductivity of the second substrate200.

This intends that heat generated from the light source 300 disposed onthe second substrate 200 may be rapidly discharged to the outside.

Also, the first substrate 100 may be a heat dissipation plate havinghigh thermal conductivity. The first substrate 100 may be made of anyone selected from the group consisting of copper (Cu), aluminum (Al),silver (Ag), gold (Au), or of an alloy thereof.

The second substrate 200 may be made of a nitride, such as AlN,exhibiting high thermal conductivity.

As shown in FIG. 45 b, the second substrate 200 may include a cavity 202formed in a predetermined area thereof and may be disposed on the firstsubstrate 100.

Here, the plurality of the light sources 300 may be disposed in thecavity 202 of the second substrate 200.

In this case, the second substrate 200 may include a barrier area, andthe cover glass 550 may be supported by a portion of an upper edge 204of the second substrate 200.

Here, the width of the barrier area of the second substrate 200 may begreater than that of the support area of the second substrate 200, whichsupports the cover glass 550.

In this case, the first substrate 100 may include at least one of Al,Cu, and Au, and the second substrate 200 may include AlN.

As such, in the embodiment, the structure of the barrier supporting thecover glass may be changed depending on the various shapes of the firstsubstrate 100 and the second substrate 200.

FIGS. 46 a to 46 d are cross sectional views showing the phosphor layerof the lamp unit according to the embodiment.

As shown in FIGS. 46 a to 46 d, the first substrate 100, the secondsubstrate 200, the plurality of light sources 300, and a phosphor layer590 may be included.

Here, the second substrate 200 may be disposed on the first substrate100. The plurality of the light sources 300 may be disposed on thesecond substrate 200.

The phosphor layer 590 may be disposed on the plurality of the lightsources 300.

Here, the phosphor layer 590 may be disposed corresponding respectivelyto the plurality of the light sources 300.

The phosphor layer 590 may include at least one of a red fluorescentsubstance, a yellow fluorescent substance, and a green fluorescentsubstance.

As shown in FIG. 46 a, the phosphor layer 590 may be formed in atrapezoidal shape. The phosphor layer 590 may be formed in a reversedtrapezoidal shape as shown in FIG. 46 b.

According to circumstances, as shown in FIGS. 46 c and 46 d, thephosphor layer 590 may be formed in a cap shape.

Here, as shown in FIG. 46 c, the phosphor layer 590 may be formed onboth the second substrate 200 and the light source 300. A thickness t81of the phosphor layer 590 formed on the second substrate 200 may beequal to a thickness t82 of the phosphor layer 590 formed on the lightsource 300.

In another case, as shown in FIG. 46 d, the thickness t81 of thephosphor layer 590 formed on the second substrate 200 may be differentfrom the thickness t82 of the phosphor layer 590 formed on the lightsource 300.

For one example, the thickness t81 of the phosphor layer 590 formed onthe second substrate 200 may be less than the thickness t82 of thephosphor layer 590 formed on the light source 300.

FIG. 47 is a cross sectional view showing the head lamp of the vehicleincluding the lamp unit according to the first embodiment.

As shown in FIG. 47, a head lamp 800 may include a lamp unit 801, areflector 802, a shade 803, and a lens 804.

Here, the reflector 802 may reflect light irradiated from the lamp unit801 in a certain direction.

The shade 803 is disposed between the reflector 802 and the lens 804 toblock or reflect a part of light reflected toward the lens 804 by thereflector 802, thereby providing a light distribution pattern desired bya designer.

The height of one side 803-1 of the shade 803 may be different from thatof the other side 803-2 of the shade 803.

Light transmitted through the glass cover of the lamp unit 801 may bereflected by the reflector 802 and the shade 803, and then directed tothe front of the vehicle through the lens 804.

Here, the lens 804 refracts light reflected by the reflector 802 to thefront.

FIG. 48 is a front view showing the head lamp of the vehicle includingthe lamp unit according to the second embodiment.

As shown in FIG. 48, a vehicle head lamp 900-1 may include a lamp unit910 and a light housing 920.

Here, the lamp unit 910 may include the above-described embodiments. Thelight housing 920 may receive the lamp unit 910 and may be formed of alight-transmitting material.

The light housing 920 may be curved based on an installation position ofa vehicle in which the light housing 920 is mounted and based on thedesign of the vehicle.

As such, in the vehicle head lamp including the lamp unit according tothe embodiment, a plurality light source arrays which can beindividually driven are disposed, thereby providing various light colorsand luminous fluxes depending upon external environments.

In the vehicle head lamp including the lamp unit according to theembodiment, a plurality of light source arrays are efficiently disposed,thereby providing an optimum luminous flux by using a small number ofthe light sources and thereby reducing the size of the lamp unit.

Also, in the vehicle head lamp including the lamp unit according to theembodiment, the light source arrays having various light emissiondirections are disposed, thereby providing various beam patternsdepending upon external environments.

Any reference in this specification to “one embodiment,” “anembodiment,” “example embodiment,” etc., means that a particularfeature, structure, or characteristic described in connection with theembodiment is included in at least one embodiment of the invention. Theappearances of such phrases in various places in the specification arenot necessarily all referring to the same embodiment. Further, when aparticular feature, structure, or characteristic is described inconnection with any embodiment, it is submitted that it is within thepurview of one skilled in the art to effect such feature, structure, orcharacteristic in connection with other ones of the embodiments.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the spirit and scope of the principles ofthis disclosure. More particularly, various variations and modificationsare possible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

1. A lamp unit comprising: a first substrate; a second substratedisposed on the first substrate; and a plurality of light sourcesdisposed on the second substrate, wherein at least two light sourcearrays are provided, in each of which a plurality of the light sourcesare disposed in a row, and wherein at least a first light source arrayand a second light source array among the light source arrays areindividually driven.
 2. The lamp unit of claim 1, wherein the pluralityof the light sources included in the first light source array areindividually driven, and wherein the plurality of the light sourcesincluded in the second light source array are interlinked with theplurality of the light sources included in the first light source array.3. The lamp unit of claim 1, wherein at least one of the numbers ofluminous fluxes of distances between, light emission directions of anddisposition planes of the light sources included in the first lightsource array and the light sources included in the second light sourcearray are mutually different.
 4. The lamp unit of claim 1, wherein adistance between a first parallel line extending from an upper surfaceof the light source included in the first light source array and asecond parallel line extending from an upper surface of the light sourceincluded in the second light source array is less than a distancebetween the upper surface and a lower surface of the light sourceincluded in the first light source array or the second light sourcearray.
 5. The lamp unit of claim 1, wherein a first parallel lineextending from an upper surface of the light source included in thefirst light source array meets an upper surface or a side surface of thelight source included in the second light source array.
 6. The lamp unitof claim 1, wherein the first light source array is supported by a firstarea of the second substrate, wherein the second light source array issupported by a second area of the second substrate, and wherein an anglebetween a surface of the first area of the second substrate facing thefirst light source array and a surface of the second area of the secondsubstrate facing the second light source array is from 91 to 179degrees.
 7. The lamp unit of claim 1, wherein, in the light sourcesincluded in the light source array, a luminous flux of the light sourcedisposed in the central area of the light source array is larger than aluminous flux of the light source disposed in the edge area of the lightsource array.
 8. The lamp unit of claim 7, wherein a distance betweenthe light sources included in the light source array is increased towardthe edge area from the central area of the light source array.
 9. Thelamp unit of claim 1, wherein at least two of the light sources includedin the light source array are disposed on different planes or havedifferent luminous fluxes.
 10. The lamp unit of claim 1, wherein thefirst substrate is a metal substrate having a first thermalconductivity, wherein and the second substrate is an insulatingsubstrate having a second thermal conductivity.
 11. The lamp unit ofclaim 10, wherein the first thermal conductivity of the first substrateis greater than the second thermal conductivity of the second substrate.12. The lamp unit of claim 1, wherein the first substrate comprises acavity formed in a predetermined area thereof, and the second substrateis disposed in the cavity of the first substrate.
 13. The lamp unit ofclaim 1, wherein the first substrate and the second substrate are formedof the same material.
 14. The lamp unit of claim 1, wherein a surface ofthe second substrate is a concave surface.
 15. The lamp unit of claim 1,wherein the second substrate comprises at least one projectionprotruding from the surface thereof by a predetermined height.
 16. Thelamp unit of claim 1, further comprising a barrier disposed around aplurality of the light sources, wherein the barrier comprises a metallicreflective material.
 17. The lamp unit of claim 1, wherein a distanced11 between the light sources included in the first light source arrayis less than a distance d13 between the light source included in thefirst light source array and the light source included in the secondlight source array.
 18. The lamp unit of claim 17, wherein a ratio ofthe distance d11 and the distance d13 is 1:1.1˜1:10.
 19. A vehicle lampdevice comprising: a lamp unit generating light; a reflector whichreflects the light generated from the lamp unit and changes a directionof the light; and a lens which refracts the light reflected from thereflector, wherein the lamp unit uses the lamp unit stated in claim 1.20. A vehicle lighting system comprising: a sensor unit sensing ambientconditions of the vehicle; a head lamp including a lamp unit whichincludes a first substrate, a second substrate disposed on the firstsubstrate, and n number of light source arrays (n is an integer equal toor greater than 2) formed by disposing a plurality of light sources onthe second substrate, wherein the light source array includes a firstlight source array and a second light source array, which are adjacentto each other, are electrically isolated from each other and areindividually driven; and an electronic control unit individually drivingthe first light source array and the second light source array inaccordance with the sensing result produced by the sensor unit.